Math, asked by rudra5023, 7 months ago

Given a=7,a13=35 find d and S13

Answers

Answered by Anonymous

1

a = 7

a13 = 35

a13 = a + 12d = 35

7 + 12d = 35

d = 28 / 12 = 7 / 3

S13 = n/2 (a + a13)

= 13/2 (7 + 35)

= 13 * 21

S13 = 273

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