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The coefficient of x^r in the expansion ...

The coefficient of `x^r` in the expansion of `(1 - 2x)^(-1/2)` is

A

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

B

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

C

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

D

`((2r)!)/(2^(r).(r+1)!..(r-1)!)`

Text Solution

Verified by Experts

The correct Answer is:
B
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