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I might found a proof on Gauß formula (n²+n/2)=1+2+...n). Have anoyone seen it before?

http://s14.directupload.net/images/130317/r45gpi7x.jpg

I´m sorry for my bad english and the bad handwriting.

(I wrote n#, just as an abbreviation, instead of 1+2+3...+n)

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# Proof on Gauß

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