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

The derivative of y = (1-x) (2-x)…(n-x) at x= 1 is

A

0

B

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

C

`n!-1`

D

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

Text Solution

Verified by Experts

`(dy)/(dx)=-[(2-x)(3-x)...(n-x)+(1-x)(3-x)...(n-x)+...(1-x)(2-x)...(n-1-x)]`
At x = 1,
`(dy)/(dx)=-[(n-1)!+0+...+0]=(-1)(n-1)!`
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