If $(1+x+x^2)^n = c_0 + c_1 x + c_2 x^2 + \ldots$,then the value of $c_0 c_1 - c_1 c_2 + c_2 c_3 - \ldots$ is

  • A
    $(-1)^n$
  • B
    $0$
  • C
    $2^n$
  • D
    $3^n$

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