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If the sum of first n terms of an AP is ...

If the sum of first n terms of an AP is `cn^(2), then the sum of squares of these n terms is

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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