{"id":4600,"date":"2016-05-17T09:49:00","date_gmt":"2016-05-17T04:19:00","guid":{"rendered":"http:\/\/mycbseguide.com\/blog\/ncert-solutions-class-11-maths-exercise-7-3\/"},"modified":"2016-05-17T11:01:02","modified_gmt":"2016-05-17T05:31:02","slug":"ncert-solutions-class-11-maths-exercise-7-3","status":"publish","type":"post","link":"https:\/\/mycbseguide.com\/blog\/ncert-solutions-class-11-maths-exercise-7-3\/","title":{"rendered":"NCERT Solutions class-11 Maths Exercise 7.3"},"content":{"rendered":"<p style=\"text-align: justify;\"><strong>Exercise 7.3<\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>1.<\/strong> <strong>How many 3-digit numbers can be formed by using the digits 1 to 9 if no digits is repeated?<\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>Ans. <\/strong>Total number of digits = 9 and Number of digits used without repetition = 3<\/p>\n<p style=\"text-align: justify;\"><img decoding=\"async\" style=\"height: 13px; width: 15px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image001.png\" \/>Number of permutations = <img decoding=\"async\" style=\"height: 25px; width: 23px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image002.png\" \/> = <img decoding=\"async\" style=\"height: 41px; width: 109px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image003.png\" \/> = 504<\/p>\n<hr \/>\n<p style=\"text-align: justify;\"><strong>2. How many 4-digit numbers are there with no digit repeated?<\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>Ans. <\/strong>Total number of digits = 10 and Number of digits used without repetition = 4<\/p>\n<p style=\"text-align: justify;\">0 cannot be filled in the fourth place therefore number of permutations for fourth place = 9<\/p>\n<p style=\"text-align: justify;\"><img decoding=\"async\" style=\"height: 13px; width: 15px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image001.png\" \/>Number of permutations = <img decoding=\"async\" style=\"height: 25px; width: 23px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image002.png\" \/> = <img decoding=\"async\" style=\"height: 41px; width: 109px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image003.png\" \/> = 504<\/p>\n<p style=\"text-align: justify;\">Hence total number of permutations = <img decoding=\"async\" style=\"height: 19px; width: 48px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image004.png\" \/>= 4536<\/p>\n<hr \/>\n<p style=\"text-align: justify;\"><strong>3. How many 3-digit even numbers can be made using the digits 1, 2, 3, 4, 6, 7 if no digit is repeated?<\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>Ans. <\/strong>Total number of digits = 6 and unit place can be filled with any one of the digits 2, 4, 6.<\/p>\n<p style=\"text-align: justify;\"><img decoding=\"async\" style=\"height: 13px; width: 15px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image001.png\" \/>Number of permutations = <img decoding=\"async\" style=\"height: 25px; width: 21px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image005.png\" \/> = <img decoding=\"async\" style=\"height: 41px; width: 69px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image006.png\" \/> = 3<\/p>\n<p style=\"text-align: justify;\">Now, the tens and hundreds places can be filled by remaining 5 digits.<\/p>\n<p style=\"text-align: justify;\"><img decoding=\"async\" style=\"height: 13px; width: 15px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image001.png\" \/>Number of permutations = <img decoding=\"async\" style=\"height: 25px; width: 24px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image007.png\" \/> = <img decoding=\"async\" style=\"height: 41px; width: 89px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image008.png\" \/> = 20<\/p>\n<p style=\"text-align: justify;\">Therefore, total number of permutations = <img decoding=\"async\" style=\"height: 19px; width: 40px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image009.png\" \/>= 60<\/p>\n<hr \/>\n<p style=\"text-align: justify;\"><strong>4. Find the number of 4-digit numbers that can be formed using the digits 1, 2, 3, 4, 5 if no digit is repeated. How many of these will be even?<\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>Ans. <\/strong>Total number of digits = 5 and Number of digits used without repetition = 4<\/p>\n<p style=\"text-align: justify;\"><img decoding=\"async\" style=\"height: 13px; width: 15px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image001.png\" \/>Number of permutations = <img decoding=\"async\" style=\"height: 25px; width: 24px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image010.png\" \/> = <img decoding=\"async\" style=\"height: 41px; width: 127px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image011.png\" \/> = 120<\/p>\n<p style=\"text-align: justify;\">Now, unit place can be filled with any one of the digits 2, 4 for even number.<\/p>\n<p style=\"text-align: justify;\"><img decoding=\"async\" style=\"height: 13px; width: 15px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image001.png\" \/>Number of permutations = <img decoding=\"async\" style=\"height: 25px; width: 23px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image012.png\" \/> = <img decoding=\"async\" style=\"height: 41px; width: 68px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image013.png\" \/> = 2<\/p>\n<p style=\"text-align: justify;\">Now, the remaining three places can be filled with the remaining 4 digits.<\/p>\n<p style=\"text-align: justify;\"><img decoding=\"async\" style=\"height: 13px; width: 15px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image001.png\" \/>Number of permutations = <img decoding=\"async\" style=\"height: 25px; width: 24px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image014.png\" \/> = <img decoding=\"async\" style=\"height: 41px; width: 108px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image015.png\" \/> = 24<\/p>\n<p style=\"text-align: justify;\">Therefore, total number of permutations of even numbers = <img decoding=\"async\" style=\"height: 17px; width: 42px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image016.png\" \/>= 48<\/p>\n<hr \/>\n<p style=\"text-align: justify;\"><strong>5. From a committee of 8 persons, in how many ways can we choose a chairman and a vice chairman assuming one person cannot hold more than one position?<\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>Ans. <\/strong>Total number of persons = 8 and Number of persons used without repetition = 2<\/p>\n<p style=\"text-align: justify;\"><img decoding=\"async\" style=\"height: 13px; width: 15px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image001.png\" \/>Number of permutations = <img decoding=\"async\" style=\"height: 25px; width: 24px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image017.png\" \/> = <img decoding=\"async\" style=\"height: 41px; width: 89px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image018.png\" \/> = 56<\/p>\n<hr \/>\n<p style=\"text-align: justify;\"><strong>6. Find <img decoding=\"async\" style=\"height: 15px; width: 13px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image019.png\" \/> if <img decoding=\"async\" style=\"height: 25px; width: 105px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image020.png\" \/> <\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>Ans. <\/strong>Given: <img decoding=\"async\" style=\"height: 25px; width: 104px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image021.png\" \/><\/p>\n<p style=\"text-align: justify;\"><img decoding=\"async\" style=\"height: 13px; width: 15px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image001.png\" \/><img decoding=\"async\" style=\"height: 49px; width: 151px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image022.png\" \/><\/p>\n<p style=\"text-align: justify;\"><img decoding=\"async\" style=\"height: 16px; width: 20px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image023.png\" \/><img decoding=\"async\" style=\"height: 49px; width: 141px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image024.png\" \/><\/p>\n<p style=\"text-align: justify;\"><img decoding=\"async\" style=\"height: 16px; width: 20px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image023.png\" \/><img decoding=\"async\" style=\"height: 44px; width: 77px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image025.png\" \/><\/p>\n<p style=\"text-align: justify;\"><img decoding=\"async\" style=\"height: 16px; width: 20px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image023.png\" \/><img decoding=\"async\" style=\"height: 49px; width: 88px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image026.png\" \/><\/p>\n<p style=\"text-align: justify;\"><img decoding=\"async\" style=\"height: 16px; width: 20px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image023.png\" \/><img decoding=\"async\" style=\"height: 41px; width: 41px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image027.png\" \/> <img decoding=\"async\" style=\"height: 16px; width: 20px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image023.png\" \/> <img decoding=\"async\" style=\"height: 19px; width: 37px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image028.png\" \/><\/p>\n<hr \/>\n<p style=\"text-align: justify;\"><strong>7. Find <img decoding=\"async\" style=\"height: 13px; width: 12px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image029.png\" \/> if: <\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>(i) <img decoding=\"async\" style=\"height: 25px; width: 77px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image030.png\" \/> <\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>(ii) <img decoding=\"async\" style=\"height: 25px; width: 69px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image031.png\" \/> <\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>Ans. (i)<\/strong> Given: <img decoding=\"async\" style=\"height: 25px; width: 81px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image032.png\" \/><\/p>\n<p style=\"text-align: justify;\"><img decoding=\"async\" style=\"height: 13px; width: 15px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image001.png\" \/><img decoding=\"async\" style=\"height: 47px; width: 129px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image033.png\" \/><\/p>\n<p style=\"text-align: justify;\"><img decoding=\"async\" style=\"height: 16px; width: 20px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image023.png\" \/> <img decoding=\"async\" style=\"height: 47px; width: 203px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image034.png\" \/><\/p>\n<p style=\"text-align: justify;\"><img decoding=\"async\" style=\"height: 16px; width: 20px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image023.png\" \/> <img decoding=\"async\" style=\"height: 47px; width: 113px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image035.png\" \/><\/p>\n<p style=\"text-align: justify;\"><img decoding=\"async\" style=\"height: 16px; width: 20px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image023.png\" \/> <img decoding=\"async\" style=\"height: 21px; width: 137px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image036.png\" \/><\/p>\n<p style=\"text-align: justify;\"><img decoding=\"async\" style=\"height: 16px; width: 20px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image023.png\" \/> <img decoding=\"async\" style=\"height: 27px; width: 119px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image037.png\" \/><\/p>\n<p style=\"text-align: justify;\"><img decoding=\"async\" style=\"height: 16px; width: 20px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image023.png\" \/> <img decoding=\"async\" style=\"height: 19px; width: 43px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image038.png\" \/> or <img decoding=\"async\" style=\"height: 19px; width: 35px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image039.png\" \/><\/p>\n<p style=\"text-align: justify;\"><img decoding=\"async\" style=\"height: 19px; width: 43px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image038.png\" \/> is not possible because <img decoding=\"async\" style=\"height: 15px; width: 36px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image040.png\" \/>, therefore, <img decoding=\"async\" style=\"height: 19px; width: 35px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image039.png\" \/><\/p>\n<p style=\"text-align: justify;\"><strong>(ii)<\/strong> Given: <img decoding=\"async\" style=\"height: 25px; width: 69px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image041.png\" \/><\/p>\n<p style=\"text-align: justify;\"><img decoding=\"async\" style=\"height: 13px; width: 15px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image001.png\" \/><img decoding=\"async\" style=\"height: 47px; width: 117px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image042.png\" \/><\/p>\n<p style=\"text-align: justify;\"><img decoding=\"async\" style=\"height: 16px; width: 20px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image023.png\" \/> <img decoding=\"async\" style=\"height: 47px; width: 203px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image043.png\" \/><\/p>\n<p style=\"text-align: justify;\"><img decoding=\"async\" style=\"height: 16px; width: 20px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image023.png\" \/> <img decoding=\"async\" style=\"height: 47px; width: 113px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image044.png\" \/><\/p>\n<p style=\"text-align: justify;\"><img decoding=\"async\" style=\"height: 16px; width: 20px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image023.png\" \/> <img decoding=\"async\" style=\"height: 21px; width: 108px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image045.png\" \/><\/p>\n<p style=\"text-align: justify;\"><img decoding=\"async\" style=\"height: 16px; width: 20px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image023.png\" \/> <img decoding=\"async\" style=\"height: 27px; width: 113px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image046.png\" \/><\/p>\n<p style=\"text-align: justify;\"><img decoding=\"async\" style=\"height: 16px; width: 20px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image023.png\" \/> <img decoding=\"async\" style=\"height: 19px; width: 36px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image047.png\" \/> or <img decoding=\"async\" style=\"height: 17px; width: 36px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image048.png\" \/><\/p>\n<p style=\"text-align: justify;\"><img decoding=\"async\" style=\"height: 19px; width: 36px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image047.png\" \/> is not possible because <img decoding=\"async\" style=\"height: 15px; width: 36px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image040.png\" \/>, therefore, <img decoding=\"async\" style=\"height: 17px; width: 36px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image048.png\" \/><\/p>\n<hr \/>\n<p style=\"text-align: justify;\"><strong>8. How many words, with or without meaning can be formed using all the letters of the word EQUATION, using each letter exactly once?<\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>Ans. <\/strong>Total number of letters in word EQUATION = 8<\/p>\n<p style=\"text-align: justify;\">Number of letters used (all different) = 8<\/p>\n<p style=\"text-align: justify;\"><img decoding=\"async\" style=\"height: 13px; width: 15px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image001.png\" \/>Number of permutations = <img decoding=\"async\" style=\"height: 25px; width: 23px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image049.png\" \/> = <img decoding=\"async\" style=\"height: 41px; width: 32px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image050.png\" \/><img decoding=\"async\" style=\"height: 19px; width: 150px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image051.png\" \/>= 40320<\/p>\n<hr \/>\n<p style=\"text-align: justify;\"><strong>9. How many words, with or without meaning can be formed using all the letters of the word MONDAY, assuming that no letter is repeated if:<\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>(i) 4 letters are used at a time <\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>(ii) all letters are used at a time<\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>(iii) all letters are used by first letter is a vowel?<\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>Ans. <\/strong>Total number of letters in word MONDAY = 6 and number of vowels = 2<\/p>\n<p style=\"text-align: justify;\"><strong>(i)<\/strong> Number of letters used = 4<\/p>\n<p style=\"text-align: justify;\"><img decoding=\"async\" style=\"height: 13px; width: 15px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image001.png\" \/>Number of permutations = <img decoding=\"async\" style=\"height: 25px; width: 24px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image052.png\" \/> = <img decoding=\"async\" style=\"height: 41px; width: 131px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image053.png\" \/> = 360<\/p>\n<p style=\"text-align: justify;\"><strong>(ii)<\/strong> Number of letters used = 6<\/p>\n<p style=\"text-align: justify;\"><img decoding=\"async\" style=\"height: 13px; width: 15px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image001.png\" \/>Number of permutations = <img decoding=\"async\" style=\"height: 25px; width: 24px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image054.png\" \/> = <img decoding=\"async\" style=\"height: 41px; width: 144px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image055.png\" \/> = 720<\/p>\n<p style=\"text-align: justify;\"><strong>(iii)<\/strong> First letter is vowel.<\/p>\n<p style=\"text-align: justify;\"><img decoding=\"async\" style=\"height: 13px; width: 15px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image001.png\" \/>Number of permutations of vowels = <img decoding=\"async\" style=\"height: 25px; width: 23px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image012.png\" \/> = <img decoding=\"async\" style=\"height: 41px; width: 64px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image056.png\" \/> = 2<\/p>\n<p style=\"text-align: justify;\">Now, remaining five places can be filled with remaining five letters.<\/p>\n<p style=\"text-align: justify;\"><img decoding=\"async\" style=\"height: 13px; width: 15px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image001.png\" \/>Number of permutations = <img decoding=\"async\" style=\"height: 25px; width: 23px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image057.png\" \/> = <img decoding=\"async\" style=\"height: 41px; width: 123px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image058.png\" \/> = 120<\/p>\n<p style=\"text-align: justify;\">Therefore, total number of permutations = <img decoding=\"async\" style=\"height: 19px; width: 48px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image059.png\" \/>= 240<\/p>\n<hr \/>\n<p style=\"text-align: justify;\"><strong>10. In how many of the distinct permutations of the letters in MISSISSIPPI do the four I\u2019s not come together?<\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>Ans. <\/strong>Total letters of the word MISSISSIPPI = 11<\/p>\n<p style=\"text-align: justify;\">Here M = 1, I = 4, S = 4 and P =2<\/p>\n<p style=\"text-align: justify;\"><img decoding=\"async\" style=\"height: 13px; width: 15px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image001.png\" \/>Number of permutations = <img decoding=\"async\" style=\"height: 41px; width: 231px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image060.png\" \/> = 34650<\/p>\n<p style=\"text-align: justify;\">When the four I\u2019s come together then it becomes one letter so total number of letters in the word when all I\u2019s come together = 8<\/p>\n<p style=\"text-align: justify;\"><img decoding=\"async\" style=\"height: 13px; width: 15px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image001.png\" \/>Number of permutations = <img decoding=\"async\" style=\"height: 41px; width: 145px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image061.png\" \/> = 840<\/p>\n<p style=\"text-align: justify;\">Number of permutations when four I\u2019s do not come together = 34650 \u2013 840 = 33810<\/p>\n<hr \/>\n<p style=\"text-align: justify;\"><strong>11. In how many ways can the letters of the word PERMUTATIONS be arranged if the:<\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>(i) words start with P and end with S<\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>(ii) vowels are all together<\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>(iii) There are always 4 letters between P and S?<\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>Ans. <\/strong>Total numbers in the word PERMUTATIONS = 12 and here T = 2<\/p>\n<p style=\"text-align: justify;\"><strong>(i)<\/strong> First letter is P and last letter is S which are fixed.<\/p>\n<p style=\"text-align: justify;\">Therefore, remaining 10 letters are to be arranged between P and S.<\/p>\n<p style=\"text-align: justify;\"><img decoding=\"async\" style=\"height: 13px; width: 15px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image001.png\" \/>Number of permutations = <img decoding=\"async\" style=\"height: 41px; width: 224px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image062.png\" \/> = 1814400<\/p>\n<p style=\"text-align: justify;\"><strong>(ii)<\/strong> There are 5 vowels in the word PERMUTATIONS. All vowels can be put together.<\/p>\n<p style=\"text-align: justify;\"><img decoding=\"async\" style=\"height: 13px; width: 15px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image001.png\" \/>Number of permutations of all vowels together = <img decoding=\"async\" style=\"height: 25px; width: 23px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image057.png\" \/> = <img decoding=\"async\" style=\"height: 41px; width: 123px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image058.png\" \/> = 120<\/p>\n<p style=\"text-align: justify;\">Now consider the 5 vowels together as one letter. SO the number of letters in the word when all vowels are together = 8<\/p>\n<p style=\"text-align: justify;\"><img decoding=\"async\" style=\"height: 13px; width: 15px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image001.png\" \/>Number of permutations = <img decoding=\"async\" style=\"height: 41px; width: 171px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image063.png\" \/> = 20160<\/p>\n<p style=\"text-align: justify;\"><strong>(iii)<\/strong> P and S are on 1<sup>st<\/sup> and 6<sup>th<\/sup> places P and S are on 2<sup>nd<\/sup> and 7<sup>th<\/sup> places<\/p>\n<p style=\"text-align: justify;\">P and S are on 3<sup>rd<\/sup> and 8<sup>th<\/sup> places P and S are on 4<sup>th<\/sup> and 9<sup>th<\/sup> places<\/p>\n<p style=\"text-align: justify;\">P and S are on 5<sup>th<\/sup> and 10<sup>th<\/sup> places P and S are on 6<sup>th<\/sup> and 11<sup>th<\/sup> places<\/p>\n<p style=\"text-align: justify;\">P and S are on 7<sup>th<\/sup> and 12<sup>th<\/sup> places<\/p>\n<p style=\"text-align: justify;\">Now, P and S can be put in 7 ways and also P and S can interchange their positions.<\/p>\n<p style=\"text-align: justify;\"><img decoding=\"async\" style=\"height: 13px; width: 15px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image001.png\" \/>Number of permutations = <img decoding=\"async\" style=\"height: 19px; width: 12px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image064.png\" \/> <img decoding=\"async\" style=\"height: 19px; width: 34px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image065.png\" \/>= 14<\/p>\n<p style=\"text-align: justify;\">Now the remaining 10 places can be filled with remaining 10 letters.<\/p>\n<p style=\"text-align: justify;\"><img decoding=\"async\" style=\"height: 13px; width: 15px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image001.png\" \/>Number of permutations = <img decoding=\"async\" style=\"height: 41px; width: 224px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image062.png\" \/> = 1814400<\/p>\n<p style=\"text-align: justify;\">Therefore, total number of permutations = <img decoding=\"async\" style=\"height: 19px; width: 85px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch07\/Ex7.3\/image066.png\" \/>= 25401600<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Exercise 7.3 1. How many 3-digit numbers can be formed by using the digits 1 to 9 if no digits is repeated? Ans. Total number of digits = 9 and Number of digits used without repetition = 3 Number of permutations = = = 504 2. How many 4-digit numbers are there with no digit &#8230; <a title=\"NCERT Solutions class-11 Maths Exercise 7.3\" class=\"read-more\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-class-11-maths-exercise-7-3\/\" aria-label=\"More on NCERT Solutions class-11 Maths Exercise 7.3\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[47,281],"tags":[],"class_list":["post-4600","post","type-post","status-publish","format-standard","hentry","category-cbse-class-11","category-ncert-solutions"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>NCERT Solutions class-11 Maths Exercise 7.3 | myCBSEguide<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-class-11-maths-exercise-7-3\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"NCERT Solutions class-11 Maths Exercise 7.3 | myCBSEguide\" \/>\n<meta property=\"og:description\" content=\"Exercise 7.3 1. How many 3-digit numbers can be formed by using the digits 1 to 9 if no digits is repeated? Ans. Total number of digits = 9 and Number of digits used without repetition = 3 Number of permutations = = = 504 2. How many 4-digit numbers are there with no digit ... 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How many 3-digit numbers can be formed by using the digits 1 to 9 if no digits is repeated? Ans. Total number of digits = 9 and Number of digits used without repetition = 3 Number of permutations = = = 504 2. How many 4-digit numbers are there with no digit ... 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