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In an AP: (ii) Given a = 7, a13 = 35, find d and S13.

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asked Mar 13, 2018 by paayal (26,720 points) ● 4 ● 6 ● 11

In an AP:

(ii) Given a = 7, a13 = 35, find d and S13.

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answered Mar 13, 2018 by sanjaydas (61,430 points) ● 5 ● 7 ● 7

Solution: 35=7+d(13-1)

➪12d=28

➪d=28/12=2.33

S13= 13/2(7+35)=273

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