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Question
How many terms of the AP 12, 29, 46... are needed to have a sum of 720?
How many terms of the AP 12, 29, 46... are needed to have a sum of 720?
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Solution
The correct option is D 9
As, we know sum of the n terms in an A.P.
(Sn)
In the given question Sn = 720 ;a = 12; d = 17; n =?
720 = 
Solving we get n = 9. 9 terms are needed to get the same
Hence option (d)
As, we know sum of the n terms in an A.P.
(Sn)
In the given question Sn = 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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