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

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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