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If(1^2-t1)+(2^2-t2)+......(n^2-tn)=1/3n(...

If`(1^2-t_1)+(2^2-t_2)+......(n^2-t_n)=1/3n(n^2-1)` ,then `t_n` is :(1)`n/2` (2) `n-1`(3)` n+1`(4) `n`

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