The sum of the series 1+(1+2) +(1+2+3) +...

The sum of the series `1+(1+2) +(1+2+3) +… upto n terms, is

A

`n^2 -2n +6`

B

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

C

`n^2 +2n +6`

D

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

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The correct Answer is:

D

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