1.

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

Answer» `(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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