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If the sum of n terms of an A.P. is c n(...

If the sum of `n` terms of an A.P. is `c n(n-1)` where `c!=0,` then the sum of the squares of these terms is `c^2n(n+1)^2` b. `2/3c^2n(n-1)(2n-1)` c. `(2c^2)/3n(n+1)(2n+1)` d. none of these

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