Hi, here is a problem involving summing a series involving a complex equation.

Sum this series:

$\displaystyle a_1 + a_2 + ... + a_{99}$

where $\displaystyle a_n = \frac{1}{(n + 1)\sqrt{n} + n\sqrt{n + 1}}$ for $\displaystyle n = 1, 2, ..., 99$

I'm not exactly sure how to start this question.

Please help, BG