MCQ
$y = (1 - x)\,(2 - x)....(n - x)$ નું $x = 1$ આગળ વિકલન મેળવો.
- A$0$
- ✓$( - 1)\,(n - 1)\,!$
- C$n!\, - \,1$
- D${( - 1)^{n - 1}}(n - 1)\,!$
$ + .....(1 - x)(2 - x).....(n - 1 - x)]$
at $x = 1$
$\frac{{dy}}{{dx}} = - [(n - 1)! + 0 + ....... + 0]$$ = ( - 1)n - 1\;!$
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