The sum of the series 1+ 3x+ 6x^2+10x^3+...

The sum of the series `1+ 3x+ 6x^2+10x^3+.......oo` will be:

A

`1/(1-x)^2`

B

`1/(1-x)`

C

`1/(1+x)^2`

D

`1/(1-x)^3`

Verified by Experts

The correct Answer is:

D

The sum of the series 1+ 3x+ 6x^2+10x^3+.......oo will be:
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