$a > 0$ માટે,ધારો કે $\frac{1}{a(a+1)(a+2) \ldots(a+20)}=\sum_{k=0}^{20} \frac{A_{k}}{a+k}$. તો $100\left(\frac{A_{14}+A_{15}}{A_{13}}\right)^{2}$ ની કિંમત $....$ છે.

  • A
    $9$
  • B
    $27$
  • C
    $3$
  • D
    $81$

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