How many terms of the AP 12, 29, 46... are needed to have a sum of 720? Options: A . &nbsp8 B . &nbsp10 C . &nbsp11 D . &nbsp9 E . &nbsp12

How many terms of the AP 12, 29, 46... are needed to have a sum of 720?

Question

How many terms of the AP 12, 29, 46... are needed to have a sum of 720?

Answer: Option D
:
D
As, we know sum of the n terms in an A.P.
(S_n)

In the given question S_n = 720 ;a = 12;d = 17;n =?
720 =

Solving we get n = 9. 9 terms are needed to get the same
Hence option (d)

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