$$$\sum_{n=1}^{\infty} \frac{n}{n + 1}$$$

求$$$\sum_{n=1}^{\infty} \frac{n}{n + 1}$$$。

By the comparison test, the series is divergent.

$$$\sum_{n=1}^{\infty} \frac{n}{n + 1}$$$ is divergent.

$$$\sum_{n=1}^{\infty} \frac{n}{n + 1}$$$A 发散。