Let $\left(2 x ^{2}+3 x +4\right)^{10}=\sum \limits_{ r =0}^{20} a _{ r } x ^{ r } \cdot$ Then $\frac{ a _{7}}{ a _{13}}$ is equal to

  • [JEE MAIN 2020]
  • A

    $4$

  • B

    $32$

  • C

    $16$

  • D

    $8$

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