$\sum\limits_{k = 0}^{10} {^{20}{C_k} = } $

  • A

    ${2^{19}} + \frac{1}{2}{\,^{20}}{C_{10}}$

  • B

    ${2^{19}}$

  • C

    $^{20}{C_{10}}$

  • D

    None of these

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