Math, asked by jvihang17, 11 months ago

-2,4,10,.......find the sum of 21 terms and 31 terms

Answers

Answered by tanejakca

0

It is AP with a=-2
We want s31 -s21
31/2(2*-2+30*6)=s31
= 2728
S21= 21/2(2*-2 +20*6)
=21*68 =1428
So rs=2728-1428 =1300

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