How do you prove the limit of a series?(adsbygoogle = window.adsbygoogle || []).push({});

For example, bn=1/square root of (n^2+1)+ 1/square root of (n^2+2) + ...+1/square root of (n^2 + n). I know this series converges since the summation of 1/n^2 does. But the only reason this is because of integration. How could I know that some series converges without using integrals, and then be able to find to what it converges?

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# Limits of Series

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