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Proof without Words: 1 + 2 + 3 + .. (n – 1) = Cn2
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Proof without Words: 1 + 2 + 3 + .. (n – 1) = Cn2

October 10, 2012 No Comments math, proof without words

Google ‘Proof without Words‘ you will find some interesting figures that are easy to understand. For example, the following figure is a vivid proof of the math formula

tex_6c2608f842c32bba09e6ac0cc291a142 Proof without Words: 1 + 2 + 3 + .. (n - 1) = Cn2 math proof without words

cc Proof without Words: 1 + 2 + 3 + .. (n - 1) = Cn2 math proof without words

Hint: Choosing any two circles result in the number of yellow circles above.

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