Let $(1 + x)(1 + x + x^2)(1 + x + x^2 + x^3) \dots (1 + x + x^2 + \dots + x^{30}) = a_0 + a_1x + a_2x^2 + \dots + a_{465}x^{465}$. Then the sum $a_0 + a_2 + a_4 + \dots$ is equal to:

  • A
    $(31)!$
  • B
    $\frac{(31)!}{2}$
  • C
    $(30)!$
  • D
    $\frac{(60)!}{2}$

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