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If the sum of n terms of A.P. is (1)/(2)...

If the sum of n terms of A.P. is `(1)/(2) (3n^(2) + 7n)` , find its `n^(th)` term and write its 25th term.

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The correct Answer is:
`= 5+24 (3) = 5+ 72 = 77`.
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