$y = (1-x)(2-x)(3-x) \dots (n-x)$ નું $x=1$ આગળ વિકલન . . . . . . છે.

  • A
    $(n-1)!$
  • B
    $n!$
  • C
    $(-1)(n-1)!$
  • D
    $(-n)(n-1)!$

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