Question

a=-3030, L=-1530, n=5 find d and Sn

Answer 1

use formula Sn = n(a+l)/2.

Answer 2

by formula

an=a+(n-1)d

put the value of a=-3030

n

and

then by getting d

put the value of D in formula

sn=n/2(2a+(n-1)D)

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