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The coefficient of x^2y^3 in the expansi...

The coefficient of `x^2y^3` in the expansion of `(1-x+y)^(20)` is `(20 !)/(213 !)` b. `-(20 !)/(213 !)` c. `(20 !)/(5!2!3!)` d. none of these

A

`(20!)/(2!3!)`

B

`-(20!)/(2!3!)`

C

`(20!)/(5!2!3!)`

D

None of these

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The correct Answer is:
D
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