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Question

The derivative of y = (1 – x) (2 – x)…. (n – x) at x = 1 is equal to

Options :

  1. 0

  2. (-1) (n – 1)!

  3. n ! – 1

  4. (-1)n-1 (n – 1)!

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Answer :

(-1) (n – 1)!

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