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The cofficient of x^(18) in the product ...

The cofficient of `x^(18)` in the product `(1 + x) (1 - x)^(1) (1 + x + x^(2))^(9)` is

A

126

B

`-84`

C

`-126`

D

84

Text Solution

Verified by Experts

The correct Answer is:
D
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