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Prove that the coefficient of x^r in the...

Prove that the coefficient of `x^r` in the expansion of `(1-2x)^(-1/2)` is `(2r!)/[(2^r)(r!)^2]`

A

`(2r)/(2^(r)(r!))`

B

`((2r)!)/(2^(r)(r!))`

C

`((2r)!)/(2^(r)(r!)^(2))`

D

None

Text Solution

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The correct Answer is:
C
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