The coefficient of $x^{4}$ is the expansion of $\left(1+\mathrm{x}+\mathrm{x}^{2}\right)^{10}$ is

  • [JEE MAIN 2020]
  • A

    $615$

  • B

    $625$

  • C

    $595$

  • D

    $575$

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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]