$\lim _{x}$ ${\rightarrow 1} \frac{(1-x)(1-x^2) \cdots (1-x^{2n})}{\{(1-x)(1-x^2) \cdots (1-x^n)\}^2} = \dots, \forall n \in N$

  • A
    $^{2n}P_n$
  • B
    $^{2n}C_n$
  • C
    $(2n)!$
  • D
    $\frac{(2n)!}{n!}$

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