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If the sum of the first 2n terms of an AP 2,5,8,…… is equal to the sum of first n term of an A.P 57,59,61,_ _ _ _ then n=________

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answer is D.

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Detailed Solution

$\frac{2 n}{2} (2 (2) + (2 n - 1) 3) = \frac{n}{2} (2 (57) + (n - 1) 2)$

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