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The coefficient of x^(n) in the expansio...

The coefficient of `x^(n)` in the expansion of
`(1-9 x + 20 x^(2))^(-1)` is

A

`5^(n)-4^(n)`

B

`5^(n+1)-4^(n+1)`

C

`5^(n+1)+4^(n+1)`

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
b
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