If the constant term, in binomial expansion of $\left(2 x^{r}+\frac{1}{x^{2}}\right)^{10}$ is $180,$ than $r$ is equal to $......$

  • [JEE MAIN 2021]
  • A

    $1$

  • B

    $2$

  • C

    $6$

  • D

    $8$

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