If (1^2-t1)+(2^2-t2)++(n^2-tn)+=(n(n^2-1...

If `(1^2-t_1)+(2^2-t_2)++(n^2-t_n)+=(n(n^2-1))/3` , then `t_n` is equal to `n^2` b. `2n` c. `n^2-2n` d. none of these

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