Coefficient of $x^{19}$ in the polynomial $(x-1) (x-2^1) (x-2^2) .... (x-2^{19})$ is

  • A

    $2^{20} -\,2^{19}$

  • B

    $-(2^{20} -1)$

  • C

    $2^{20}$

  • D

    None

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