For all \( n \in \mathbb{N} \frac{n^{5}}{5}+\frac{n^{3}}{3}+\frac{7}{15 n} \) is....

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For all \( n \in \mathbb{N} \frac{n^{5}}{5}+\frac{n^{3}}{3}+\frac{7}{15 n} \) is
\( \mathrm{P} \)
W
(1) an integer
(2) a natural number
(3) a positive fraction (4) rational number


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