differentiation

Question: The derivative of $y = (1 - x)\,(2 - x)....(n - x)$ at $x = 1$ is equal to



1) 0
2) $( - 1)\,(n - 1)\,!$
3) $n!\, - \,1$
4) ${( - 1)^{n - 1}}(n - 1)\,!$
Solution: Explanation: Explanation
standard-differentiation

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