The proposition that is not true for \( n1(n \in N) \), \( \mathrm{...

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The proposition that is not true for \( n1(n \in N) \),
\( \mathrm{P} \) is:

WV
(1) \( 1+\frac{1}{4}+\frac{1}{9}+\ldots+\frac{1}{n^{2}}2-\frac{1}{n} \)
(2) \( 1+\frac{1}{\sqrt{2}}+\frac{1}{\sqrt{3}}+\ldots+\frac{1}{\sqrt{n}}\sqrt{n} \)
(3) \( \frac{1}{n+1}+\frac{1}{n+2}+\ldots+\frac{1}{2 n}\frac{13}{24} \)
(4) \( \frac{1}{2} \cdot \frac{3}{4} \cdot \frac{5}{6} \ldots \ldots \frac{2 n-1}{2 n}\frac{1}{\sqrt{3 n+1}} \)
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