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Find the sum of n terms of the series 1....

Find the sum of `n` terms of the series `1. 2^2+2. 3^2+3. 4^2+`

A

`(n(n+1))/2`

B

`(n^2(n+1))/2`

C

`(n(n+1)^2)/4`

D

`[(n(n+1))/2]^2` .

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