\( \lim _{n \rightarrow \infty} \sum_{r=1}^{4 n} \frac{\sqrt{n}}{\s...

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\( \lim _{n \rightarrow \infty} \sum_{r=1}^{4 n} \frac{\sqrt{n}}{\sqrt{r}(3 \sqrt{r}+4 \sqrt{n})^{2}} \) is equal to
\( \mathrm{P}^{21:} \)
W
(1) \( \frac{1}{35} \)
(2) \( \frac{1}{14} \)
(3) \( \frac{1}{10} \)
(4) \( \frac{1}{5} \)
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