1.

The sum of first n terms of the series 1_(2) + 2.2^(2) + 3^(2) + 2.4^(2) + 5^(2) + 2.6^(2) + ...... is (n(n + 1)^(2))/4 when n is even. When n odd the sum is

Answer»

`(n(n + 1)^(2))/4`
`(n^(2)(n + 1))/2`
`(3N(n + 1))/2`
`[(n(n + 1))/2]^(2)`

ANSWER :B


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