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Fifth term of an AP is 20 and the sum of its seventh and eleventh term is 64. Find the common difference of the AP ?

Posted by Ankit Pratap Singh 6 years, 9 months ago

CBSE > Class 10 > Mathematics

2 answers

Ishita Garg 6 years, 9 months ago

5th term is 20. a+4d = 20.---- (1) 7th term + 11th term is 64 a+6d +a + 10d = 64. 2a + 16d = 64. a+8d = 32.-----(2) solving equations 1 and 2. 4d = 12. d= 3..

2Thank You

Affu 😊 6 years, 9 months ago

a5= 20 , a+4d =20 -----(i) , a7+a11=64 , a+6d+a+10d=64 , 2a+16d=64 , a+8d=32 ------(ii) , solving eqn (i) and (ii) the value of d= 3

2Thank You

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