1.

Given a = 7, a13 =35, find d and S13​

Answer»

ANSWER:

n=13

a=7

a13=35

so, a13=a+(n-1)d

or,35=7+(13-1)d

or, 12d=28

or, d=7/3

so, S13 =n/2{2A+(n-1)d}

= 13/2{14+12×7/3}

=13/2{14+28}

=13/2×42

=273

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