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In the expansion of (1+x+x^2+...oo)^3 th...

In the expansion of `(1+x+x^2+...oo)^3` the coefficient of `x^n` is

A

`-3`

B

`3`

C

`9`

D

`-9`

Text Solution

Verified by Experts

The correct Answer is:
B
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