Intro
http://www.youtube.com/watch?v=C7tE26CDI2M
Formula for nth term
http://www.youtube.com/watch?v=IGFQXInm-co&feature=relmfu
Infinite sum and repeating decimals
http://www.youtube.com/watch?v=7GNTz2CbPYs
http://www.youtube.com/watch?v=nDm74LdP54w
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