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

  • A
    $\frac{3^{n+1} - 1}{2 \cdot 3^{n+1}}$
  • B
    $\frac{3^{n+1} - 1}{3^{n+1}}$
  • C
    $\frac{3^{n+1} + 1}{2 \cdot 3^{n+1}}$
  • D
    इनमें से कोई नहीं

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