यदि $\frac{1}{x(x+1)(x+2) \ldots(x+n)} = \sum_{r=0}^{n} \frac{A_r}{x+r}$ है,तो $A_r$ का मान ज्ञात कीजिए:

  • A
    $(-1)^r \frac{r!}{(n-r)!}$
  • B
    $(-1)^r \frac{1}{r!(n-r)!}$
  • C
    $\frac{1}{r!(n-r)!}$
  • D
    $\frac{r!}{(n-r)!}$

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यदि $\frac{3x-2}{(x+1)^2(x+3)}=\frac{A}{x+1}+\frac{B}{(x+1)^2}+\frac{C}{x+3}$ है,तो $A+B+C=$

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