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If the sum of first 7 terms of as AP is 49 and that of 17 terms is 289,find the AP

Posted by Dipender Saini 1 year, 10 months ago

CBSE > Class 10 > Mathematics

1 answers

Aman Sharma 1 year, 10 months ago

7/2(2a+6D)=49 , 17/2(2a+16D)=289 7a+42D=49 , 17a+272D=289 a+6D=7-(1) , a+16D=17 =)a+6D=7 =)a+16D=17 -10D=-10 D=1 a=7-6(1) a=7-6 a=1 A.P.:-1,2,3,4....

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