If $n$ is an integer greater than $1$, then $a{ - ^n}{C_1}(a - 1){ + ^n}{C_2}(a - 2) + .... + {( - 1)^n}(a - n) = $

  • [IIT 1972]
  • A

    $a$

  • B

    $0$

  • C

    ${a^2}$

  • D

    ${2^n}$

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