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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)!`

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