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Find the coefficient of x^n in the expan...

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

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

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The correct Answer is:
B
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