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The deerivative of y=(1-x) (2-x) ..(n-x)...

The deerivative of `y=(1-x) (2-x) ..(n-x)` at `x=1` is equal to-

A

0

B

`-(n-1)!`

C

`(-1) ^(n) (n-1)!`

D

`(-1)^(n-1) (n-1)!`

Text Solution

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The correct Answer is:
B
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