The coefficient of x^(5) in (1+2x+3x^(2)...

The coefficient of `x^(5)` in `(1+2x+3x^(2)+…)^(-3//2)` is `(|x| lt 1)`

A

A) 21

B

B) 25

C

C) 26

D

D) 0

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The correct Answer is:

D

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