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

The coefficient of `x^(5)` in `(1+2x+3x^(2)+ . . .)^(-3//2)` is:

A

21

B

25

C

26

D

none of these

Text Solution

Verified by Experts

The correct Answer is:
D
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