$x$ ના વધતા ઘાતાંકોમાં $\frac{x - 4}{x^2 - 5x + 6}$ ના વિસ્તરણમાં $x^n$ નો સહગુણક શોધો.

  • A
    $\frac{-1}{2^n} - \frac{1}{3^{n+1}}$
  • B
    $\frac{1}{2^n} - \frac{1}{3^{n-1}}$
  • C
    $\frac{-1}{2^n} + \frac{1}{3^{n+1}}$
  • D
    $\frac{-1}{2^n} + \frac{1}{3^{n-1}}$

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જો $\frac{x}{(x - 1)(x^2 + 1)^2} = \frac{1}{4} \left[ \frac{1}{x - 1} - \frac{x + 1}{x^2 + 1} \right] + y$ હોય,તો $y =$

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