Which series must diverge by the Divergence Test?
∑n=1∞1n\sum_{n=1}^{\infty} \frac{1}{n}∑n=1∞n1
∑n=1∞(−1)nn\sum_{n=1}^{\infty} \frac{(-1)^n}{\sqrt{n}}∑n=1∞n(−1)n
∑n=1∞3n2n2+1\sum_{n=1}^{\infty} \frac{3n^2}{n^2+1}∑n=1∞n2+13n2
∑n=1∞1en\sum_{n=1}^{\infty} \frac{1}{e^n}∑n=1∞en1