મર્યાદાની ગણતરી કરો: $\lim _{n \rightarrow \infty} \sum_{r=1}^n \frac{r+2}{r(r+1)(r+3)}$

  • A
    $\frac{29}{36}$
  • B
    $\frac{1}{36}$
  • C
    $\frac{5}{36}$
  • D
    $\frac{23}{36}$

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ધારો કે $a, b$, અને $c$ એવા છે કે $\frac{1}{(1-x)(1-2x)(1-3x)} = \frac{a}{1-x} + \frac{b}{1-2x} + \frac{c}{1-3x}$. તો $\frac{a}{1} + \frac{b}{3} + \frac{c}{5}$ ની કિંમત શોધો.

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