Mock AIME 3 Pre 2005 Problems/Problem 6

Revision as of 22:03, 24 February 2007 by Me@home (talk | contribs)
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)

$6.$ Let $S$ denote the value of the sum

$\sum_{n = 1}^{9800} \frac{1}{\sqrt{n + \sqrt{n^2 - 1}}}$

$S$ can be expressed as $p + q \sqrt{r}$, where $p, q,$ and $r$ are positive integers and $r$ is not divisible by the square of any prime. Determine $p + q + r$.