The term independent of $x$ in expansion of ${\left( {\frac{{x + 1}}{{{x^{2/3}} - {x^{\frac{1}{3}}} + 1\;}}--\frac{{x - 1}}{{x - {x^{1/2}}}}} \right)^{10}}$ is

  • [JEE MAIN 2013]
  • A

    $4$

  • B

    $120$

  • C

    $210$

  • D

    $310$

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