1.

I) given a = 7, 913 =35, find d and S13.​

Answer»

Step-by-step EXPLANATION:

a =7

S13=n/2 (2a+(n-1)d)

= 13/2(14 +12D ) =35

=13/2 *2(7 +6D) =35

=91 + 78d = 35

= 78d= 35 -91

= d = -56/78. = -14/17



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