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If the n^(t h) term of an A.P. is (2n+1)...

If the `n^(t h)` term of an A.P. is `(2n+1),` find the sum of first `n` terms of the A.P.

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If the n^(t h) term of an A.P. is 2n+1 , then the sum of first n terms of the A.P. is n(n-2) (b) n(n+2) (c) n(n+1) (d) n(n-1)

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