Sum of an Infinite Series (1 Viewer)

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I got the following problem for my Calculus course:

http://img291.imageshack.us/img291/7449/problemsw3.jpg [Broken]

I know the answer to this is 2, but I can't seem to make any headway in this problem. Can somebody give me a hint?
 
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Do you know what a telescoping series is? It looks like that series is pretty close to one.
 

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