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If the sum of first n terms of an A P ...

If the sum of first `n` terms of an `A P` is `c n^2,` then the sum of squares of these `n` terms is (2009) (a) `(n(4n^2-1)c^2)/6` (b) `(n(4n^2+1)c^2)/3` (c) `(n(4n^2-1)c^2)/3` (d) `(n(4n^2+1)c^2)/6`

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