Find sum of series 1.2 + 2.3 + 3.4 ........

Find sum of series `1.2 + 2.3 + 3.4 .....` upto n terms

A

`n^3`

B

`1/3n (n+1)(n+2)`

C

`1/6n (n+1)(n+2)`

D

`1/3n (n+1)(2n+1)`

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The correct Answer is:

B

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