The coefficient of $x^{7}$ in the expression $(1+x)^{10}+x(1+x)^{9}+x^{2}(1+x)^{8}+\ldots+x^{10}$ is

  • [JEE MAIN 2020]
  • A

    $120$

  • B

    $330$

  • C

    $210$

  • D

    $420$

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