Proof by Induction
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Proving an expression for the sum of all positive integers up to and including n by induction
More free lessons at: http://www.khanacademy.org/video?v=wblW_M_HVQ8
More free lessons at: http://www.khanacademy.org/video?v=wblW_M_HVQ8
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![Pythagoras Would Be Proud: High School Students' New Proof of the Pythagorean Theorem [TRIGONOMETRY]](https://i.ytimg.com/vi/p6j2nZKwf20/mqdefault.jpg)
