$\frac{1 - 2x + 3x^2}{e^x}$ के विस्तार में,$x^5$ का गुणांक क्या होगा?

  • A
    $\frac{71}{120}$
  • B
    $-\frac{71}{120}$
  • C
    $\frac{31}{40}$
  • D
    $-\frac{31}{40}$

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