{"id":4634,"date":"2016-05-17T11:49:00","date_gmt":"2016-05-17T06:19:00","guid":{"rendered":"http:\/\/mycbseguide.com\/blog\/ncert-solutions-class-11-maths-miscellaneous-12\/"},"modified":"2016-05-17T13:36:31","modified_gmt":"2016-05-17T08:06:31","slug":"ncert-solutions-class-11-maths-miscellaneous-12","status":"publish","type":"post","link":"https:\/\/mycbseguide.com\/blog\/ncert-solutions-class-11-maths-miscellaneous-12\/","title":{"rendered":"NCERT Solutions class-11 Maths Miscellaneous"},"content":{"rendered":"<p style=\"text-align: justify;\"><strong>Miscellaneous Exercise<\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>1. Write the negation of the following statements:<\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>(i) <\/strong><img decoding=\"async\" style=\"height: 17px; width: 21px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch14\/Misc\/image001.png\" \/><strong> For every positive real number <\/strong><img decoding=\"async\" style=\"height: 15px; width: 13px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch14\/Misc\/image002.png\" \/><strong>, the number <\/strong><img decoding=\"async\" style=\"height: 19px; width: 32px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch14\/Misc\/image003.png\" \/><strong> is also positive.<\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>(ii) <\/strong><img decoding=\"async\" style=\"height: 17px; width: 19px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch14\/Misc\/image004.png\" \/><strong> All cats scratch.<\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>(iii) <\/strong><img decoding=\"async\" style=\"height: 15px; width: 17px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch14\/Misc\/image005.png\" \/><strong> For every real number <\/strong><img decoding=\"async\" style=\"height: 15px; width: 13px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch14\/Misc\/image002.png\" \/><strong>, either <\/strong><img decoding=\"async\" style=\"height: 19px; width: 35px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch14\/Misc\/image006.png\" \/><strong> or <\/strong><img decoding=\"async\" style=\"height: 19px; width: 39px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch14\/Misc\/image007.png\" \/><\/p>\n<p style=\"text-align: justify;\"><strong>(iv) <\/strong><img decoding=\"async\" style=\"height: 15px; width: 17px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch14\/Misc\/image008.png\" \/><strong> There exists a number <\/strong><img decoding=\"async\" style=\"height: 15px; width: 13px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch14\/Misc\/image002.png\" \/><strong> such that <\/strong><img decoding=\"async\" style=\"height: 19px; width: 61px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch14\/Misc\/image009.png\" \/><\/p>\n<p style=\"text-align: justify;\"><strong>Ans. (i) <\/strong><img decoding=\"async\" style=\"height: 17px; width: 33px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch14\/Misc\/image010.png\" \/> There exists a positive real number <img decoding=\"async\" style=\"height: 15px; width: 13px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch14\/Misc\/image002.png\" \/> such that <img decoding=\"async\" style=\"height: 19px; width: 32px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch14\/Misc\/image003.png\" \/> is not positive.<\/p>\n<p style=\"text-align: justify;\"><strong>(ii) <\/strong><img decoding=\"async\" style=\"height: 17px; width: 32px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch14\/Misc\/image011.png\" \/> There exists a cat which does not scratch.<\/p>\n<p style=\"text-align: justify;\"><strong>(iii) <\/strong><img decoding=\"async\" style=\"height: 15px; width: 31px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch14\/Misc\/image012.png\" \/> There exists a real number <img decoding=\"async\" style=\"height: 15px; width: 13px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch14\/Misc\/image002.png\" \/> such that <img decoding=\"async\" style=\"height: 19px; width: 35px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch14\/Misc\/image006.png\" \/> or <img decoding=\"async\" style=\"height: 19px; width: 39px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch14\/Misc\/image007.png\" \/><\/p>\n<p style=\"text-align: justify;\"><strong>(iv) <\/strong><img decoding=\"async\" style=\"height: 15px; width: 31px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch14\/Misc\/image013.png\" \/> There does not exist a number <img decoding=\"async\" style=\"height: 15px; width: 13px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch14\/Misc\/image002.png\" \/> such that <img decoding=\"async\" style=\"height: 19px; width: 61px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch14\/Misc\/image009.png\" \/><\/p>\n<hr \/>\n<p style=\"text-align: justify;\"><strong>2. State the converse and contrapositive of each of the following statements:<\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>(i) <\/strong><img decoding=\"async\" style=\"height: 17px; width: 21px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch14\/Misc\/image001.png\" \/><strong> A positive integer is prime only if it has no divisors other than 1 and itself.<\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>(ii) <\/strong><img decoding=\"async\" style=\"height: 17px; width: 19px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch14\/Misc\/image004.png\" \/><strong> I go to a beach whenever it is a sunny day.<\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>(iii) <\/strong><img decoding=\"async\" style=\"height: 15px; width: 17px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch14\/Misc\/image005.png\" \/><strong> If it is not outside, then you feel thirsty.<\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>Ans. (i) <\/strong>Contrapositive: If a positive integer has divisors other than 1 and itself then it is not prime.<\/p>\n<p style=\"text-align: justify;\">Converse: If a positive integer has no divisors other than 1 and itself then it is a prime.<\/p>\n<p style=\"text-align: justify;\"><strong>(ii) <\/strong>Contrapositive: If I do not go to a beach then it is not a sunny day.<\/p>\n<p style=\"text-align: justify;\">Converse: If I go to a beach then it is a sunny day.<\/p>\n<p style=\"text-align: justify;\"><strong>(iii) <\/strong>Contrapositive: If you do not feel thirsty then it is not hot outside.<\/p>\n<p style=\"text-align: justify;\">Converse: If you feel thirsty then it is hot outside.<\/p>\n<hr \/>\n<p style=\"text-align: justify;\"><strong>3. Rewrite each of the following statements in the form \u201c<\/strong><img decoding=\"async\" style=\"height: 17px; width: 16px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch14\/Misc\/image014.png\" \/><strong> it and only if <\/strong><img decoding=\"async\" style=\"height: 17px; width: 13px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch14\/Misc\/image015.png\" \/><strong>\u201d.<\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>(i) <img decoding=\"async\" style=\"height: 17px; width: 21px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch14\/Misc\/image001.png\" \/> It is necessary to have a password to log on to the server.<\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>(ii) <img decoding=\"async\" style=\"height: 17px; width: 19px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch14\/Misc\/image004.png\" \/> There is traffic Jam whenever it rains.<\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>(iii) <img decoding=\"async\" style=\"height: 15px; width: 17px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch14\/Misc\/image005.png\" \/> You can access the website only if you pay a subscription fee.<\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>Ans. (i) <\/strong>If you log on to the server then you have a password.<\/p>\n<p style=\"text-align: justify;\"><strong>(ii) <\/strong>If it rains, then there is traffic jam.<\/p>\n<p style=\"text-align: justify;\"><strong>(iii) <\/strong>If you can access the website, then you pay a subscription fee.<\/p>\n<hr \/>\n<p style=\"text-align: justify;\"><strong>4. Rewrite each of the following statements in the form \u201c<\/strong><img decoding=\"async\" style=\"height: 17px; width: 16px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch14\/Misc\/image014.png\" \/><strong> it and only if <\/strong><img decoding=\"async\" style=\"height: 17px; width: 13px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch14\/Misc\/image015.png\" \/><strong>\u201d.<\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>(i) <\/strong><img decoding=\"async\" style=\"height: 17px; width: 21px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch14\/Misc\/image001.png\" \/><strong> If you watch television, then your mind is free and if your mind is free, then you watch television.<\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>(ii) <\/strong><img decoding=\"async\" style=\"height: 17px; width: 19px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch14\/Misc\/image004.png\" \/><strong> For you to get an A grade, it is necessary and sufficient that you do all the homework regularly.<\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>(iii) <\/strong><img decoding=\"async\" style=\"height: 15px; width: 17px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch14\/Misc\/image005.png\" \/><strong> If a quadrilateral is equiangular, then it is a rectangle and if a quadrilateral is a rectangle, then it is equiangular.<\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>Ans. (i) <\/strong>You watch television if and only if your mind is free.<\/p>\n<p style=\"text-align: justify;\"><strong>(ii) <\/strong>You get an A grade if and only if you do all the homework regularly.<\/p>\n<p style=\"text-align: justify;\"><strong>(iii) <\/strong>A quadrilateral is equiangular if and only if it is a rectangle.<\/p>\n<hr \/>\n<p style=\"text-align: justify;\"><strong>5. Given below are two statements:<\/strong><\/p>\n<p style=\"text-align: justify;\"><strong><img decoding=\"async\" style=\"height: 17px; width: 21px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch14\/Misc\/image001.png\" \/> 25 is a multiple of 5.<\/strong><\/p>\n<p style=\"text-align: justify;\"><strong><img decoding=\"async\" style=\"height: 17px; width: 19px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch14\/Misc\/image004.png\" \/> 25 is a multiple of 8.<\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>Write the compound statements connecting these two statements with \u201cand\u201d and \u201cor\u201d. In both cases check the validity of the compound statement.<\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>Ans. <\/strong>The compound statement with \u201cand\u201d is: 25 is a multiple of 5 and 8.<\/p>\n<p style=\"text-align: justify;\">Since, <img decoding=\"async\" style=\"height: 17px; width: 16px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch14\/Misc\/image014.png\" \/> is true and <img decoding=\"async\" style=\"height: 17px; width: 13px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch14\/Misc\/image015.png\" \/> is false therefore the compound statement with \u201cand\u201d is not true.<\/p>\n<p style=\"text-align: justify;\">Therefore, the statement \u201c<img decoding=\"async\" style=\"height: 17px; width: 16px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch14\/Misc\/image014.png\" \/> and <img decoding=\"async\" style=\"height: 17px; width: 13px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch14\/Misc\/image015.png\" \/>\u201d is not valid.<\/p>\n<p style=\"text-align: justify;\">Now the compound statement with \u201cor\u201d is: 25 is a multiple of 5 or 8.<\/p>\n<p style=\"text-align: justify;\">Since, <img decoding=\"async\" style=\"height: 17px; width: 16px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch14\/Misc\/image014.png\" \/> is true and <img decoding=\"async\" style=\"height: 17px; width: 13px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch14\/Misc\/image015.png\" \/> is false therefore the compound statement with \u201cor\u201d is true.<\/p>\n<p style=\"text-align: justify;\">Therefore, the statement \u201c<img decoding=\"async\" style=\"height: 17px; width: 16px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch14\/Misc\/image014.png\" \/> and <img decoding=\"async\" style=\"height: 17px; width: 13px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch14\/Misc\/image015.png\" \/>\u201d is valid.<\/p>\n<hr \/>\n<p style=\"text-align: justify;\"><strong>6. Check the validity of the statements given below by the method given against it:<\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>(i) <\/strong><img decoding=\"async\" style=\"height: 17px; width: 21px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch14\/Misc\/image001.png\" \/><strong> The sum of an irrational number and a rational number is irrational (by contradiction method)<\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>(ii) <\/strong><img decoding=\"async\" style=\"height: 17px; width: 19px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch14\/Misc\/image004.png\" \/><strong> If <\/strong><img decoding=\"async\" style=\"height: 15px; width: 13px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch14\/Misc\/image016.png\" \/><strong> is a real number with <\/strong><img decoding=\"async\" style=\"height: 21px; width: 40px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch14\/Misc\/image017.png\" \/><strong> then <\/strong><img decoding=\"async\" style=\"height: 21px; width: 44px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch14\/Misc\/image018.png\" \/><strong> (by contradiction method)<\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>Ans. (i) <\/strong>Let us assume that <img decoding=\"async\" style=\"height: 17px; width: 16px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch14\/Misc\/image014.png\" \/> is not true.<\/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\/ch14\/Misc\/image019.png\" \/>Sum of an irrational and a rational number is not irrational.<\/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\/ch14\/Misc\/image020.png\" \/>There exists an irrational number <img decoding=\"async\" style=\"height: 15px; width: 13px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch14\/Misc\/image021.png\" \/> and a rational number <img decoding=\"async\" style=\"height: 19px; width: 13px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch14\/Misc\/image022.png\" \/> such that <img decoding=\"async\" style=\"height: 19px; width: 36px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch14\/Misc\/image023.png\" \/> is not irrational.<\/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\/ch14\/Misc\/image020.png\" \/> <img decoding=\"async\" style=\"height: 19px; width: 59px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch14\/Misc\/image024.png\" \/> (say) is a rational number.<\/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\/ch14\/Misc\/image020.png\" \/> <img decoding=\"async\" style=\"height: 19px; width: 59px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch14\/Misc\/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\/ch14\/Misc\/image020.png\" \/> <img decoding=\"async\" style=\"height: 15px; width: 13px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch14\/Misc\/image021.png\" \/> is rational.<\/p>\n<p style=\"text-align: justify;\">But <img decoding=\"async\" style=\"height: 15px; width: 13px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch14\/Misc\/image021.png\" \/> is irrational, which is contradiction, therefore our supposition is wrong.<\/p>\n<p style=\"text-align: justify;\">Therefore, <img decoding=\"async\" style=\"height: 17px; width: 16px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch14\/Misc\/image014.png\" \/> is true.<\/p>\n<p style=\"text-align: justify;\"><strong>(ii) <\/strong>Let <img decoding=\"async\" style=\"height: 13px; width: 12px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch14\/Misc\/image026.png\" \/> and <img decoding=\"async\" style=\"height: 15px; width: 12px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch14\/Misc\/image027.png\" \/> be the statements given by<\/p>\n<p style=\"text-align: justify;\"><img decoding=\"async\" style=\"height: 15px; width: 29px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch14\/Misc\/image028.png\" \/> is a real number with <img decoding=\"async\" style=\"height: 19px; width: 36px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch14\/Misc\/image029.png\" \/><\/p>\n<p style=\"text-align: justify;\"><img decoding=\"async\" style=\"height: 21px; width: 60px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch14\/Misc\/image030.png\" \/><\/p>\n<p style=\"text-align: justify;\">If possible let <img decoding=\"async\" style=\"height: 17px; width: 13px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch14\/Misc\/image015.png\" \/> is not true, then <img decoding=\"async\" style=\"height: 17px; width: 27px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch14\/Misc\/image031.png\" \/> is true.<\/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\/ch14\/Misc\/image020.png\" \/> <img decoding=\"async\" style=\"height: 13px; width: 12px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch14\/Misc\/image026.png\" \/> and <img decoding=\"async\" style=\"height: 15px; width: 25px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch14\/Misc\/image032.png\" \/> is true.<\/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\/ch14\/Misc\/image020.png\" \/> <img decoding=\"async\" style=\"height: 15px; width: 13px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch14\/Misc\/image016.png\" \/> is a real number with <img decoding=\"async\" style=\"height: 19px; width: 36px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch14\/Misc\/image029.png\" \/> and <img decoding=\"async\" style=\"height: 21px; width: 43px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch14\/Misc\/image033.png\" \/> which is contradiction, therefore our supposition is wrong.<\/p>\n<p style=\"text-align: justify;\">Therefore, <img decoding=\"async\" style=\"height: 17px; width: 13px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch14\/Misc\/image015.png\" \/> is true.<\/p>\n<hr \/>\n<p style=\"text-align: justify;\"><strong>7. Write the following statement in five different ways, conveying the same meaning:<\/strong><\/p>\n<p style=\"text-align: justify;\"><strong><img decoding=\"async\" style=\"height: 17px; width: 21px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/11\/maths\/ch14\/Misc\/image001.png\" \/> If a triangle is equiangular, then it is an obtuse angled triangle.<\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>Ans. (i) <\/strong>A triangle is equiangular implies that it is an obtuse angled triangle.<\/p>\n<p style=\"text-align: justify;\"><strong>(ii) <\/strong>A triangle is equiangular only if it an obtuse angled triangle.<\/p>\n<p style=\"text-align: justify;\"><strong>(iii) <\/strong>For a triangle to be equiangular it is necessary it is an obtuse angled triangle.<\/p>\n<p style=\"text-align: justify;\"><strong>(iv) <\/strong>For a triangle to be obtuse angled triangle it is sufficient that the triangle is equiangular.<\/p>\n<p style=\"text-align: justify;\"><strong>(v) <\/strong>Is a triangle is not equiangular then it is not an obtuse angled triangle.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Miscellaneous Exercise 1. Write the negation of the following statements: (i) For every positive real number , the number is also positive. (ii) All cats scratch. (iii) For every real number , either or (iv) There exists a number such that Ans. (i) There exists a positive real number such that is not positive. (ii) &#8230; <a title=\"NCERT Solutions class-11 Maths Miscellaneous\" class=\"read-more\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-class-11-maths-miscellaneous-12\/\" aria-label=\"More on NCERT Solutions class-11 Maths Miscellaneous\">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-4634","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 Miscellaneous | 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-miscellaneous-12\/\" \/>\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 Miscellaneous | myCBSEguide\" \/>\n<meta property=\"og:description\" content=\"Miscellaneous Exercise 1. Write the negation of the following statements: (i) For every positive real number , the number is also positive. (ii) All cats scratch. (iii) For every real number , either or (iv) There exists a number such that Ans. (i) There exists a positive real number such that is not positive. (ii) ... 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