सीमा का मूल्यांकन करें: $\lim _{n \rightarrow \infty} \sum_{r=1}^n \frac{r+2}{r(r+1)(r+3)}$

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

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