If the coefficients of $x^{7}$ and $x^{8}$ in the expansion of $\left(2+\frac{x}{3}\right)^{n}$ are equal, then the value of $n$ is equal to $.....$

  • [JEE MAIN 2021]
  • A

    $44$

  • B

    $55$

  • C

    $48$

  • D

    $61$

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