यदि $\frac{x^{4}}{(x - 1)(x - 2)} = f(x) + \frac{A}{x - 1} + \frac{B}{x - 2}$ है,तो

  • A
    $f(x) = x^{2} - 3x + 7$
  • B
    $f(x) = x^{2} + 3x + 7$
  • C
    $A + B = 17$
  • D
    $A - B = -18$

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$|x| < 1$ के लिए $\frac{1}{x^2-5x+6}$ के विस्तार में $x^n$ का गुणांक क्या है?

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