$a > 0$ के लिए,मान लीजिए $\frac{1}{a(a+1)(a+2) \ldots(a+20)}=\sum_{k=0}^{20} \frac{A_{k}}{a+k}$. तब $100\left(\frac{A_{14}+A_{15}}{A_{13}}\right)^{2}$ का मान $....$ है।

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

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$\frac{1-2x}{(2x+1)(2-x)}$ के विस्तार में $x^3$ का गुणांक क्या है?

यदि $\frac{9x-7}{(x+3)(x^2+1)} = \frac{A}{x+3} + \frac{Bx+C}{x^2+1}$, जहाँ $A, B, C \in \mathbb{R}$, तो $A+B+C = $

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