Q .     If the sum of first `n` terms of an `A.P`. is `cn^2,` then the sum of squares of these n terms is

JEE 2009
A

`c^2n/6(4n^2-1)`

B

`c^2n/3(4n^2+1)`

C

`c^2n/3(4n^2-1)`

D

`c^2n/6(4n^2+1)`

HINT

use this `T_n=S_n-S_(n-1)`
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