Sum to n terms of the series 1+(1+2)+(1+...

Sum to n terms of the series `1+(1+2)+(1+2+3)+.. ..`

A

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

B

`(n(n+1)(3n^2+23n+46))/12`

C

`(n(27n^3+90n^2+45n-50))/4`

D

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

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The correct Answer is:

A

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