If the sum of the coefficients in the expansion of ${(1 - 3x + 10{x^2})^n}$ is $a$ and if the sum of the coefficients in the expansion of ${(1 + {x^2})^n}$ is $b$, then

  • A

    $a = 3b$

  • B

    $a = {b^3}$

  • C

    $b = {a^3}$

  • D

    None of these

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  • [JEE MAIN 2021]

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