If for positive integers $r > 1,n > 2$ the coefficient of the ${(3r)^{th}}$ and ${(r + 2)^{th}}$ powers of $x$ in the expansion of ${(1 + x)^{2n}}$ are equal, then

  • [AIEEE 2002]
  • [IIT 1983]
  • A

    $n = 2r$

  • B

    $n = 3r$

  • C

    $n = 2r + 1$

  • D

    None of these

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