1.

The sum of 1^(st) n terms of the series (1^(2))/(1) + (1^(2) + 2^(2))/(1 + 2) + (1^(2) + 2^(2) + 3^(2))/(1 + 2 + 3) +..

Answer»

1)`(n+2)/(3)`
2)`(n(n+2))/(3)`
3)(n(n-2))/(3)`
4)`(n(n-2))/(6)`

Answer :B


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