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- Feb 21st 2008, 03:07 AMhotgal24Come solve this if u think you are smart=)
- Feb 21st 2008, 03:23 AMPlato
Here is a hint to help you.

$\displaystyle \frac{1}{{\sqrt k + \sqrt {k + 1} }} = \left( {\frac{1}{{\sqrt k + \sqrt {k + 1} }}} \right)\frac{{\sqrt k - \sqrt {k + 1} }}{{\sqrt k - \sqrt {k + 1} }} = \sqrt {k + 1} - \sqrt k $