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posted by Jose on Sunday, December 27, 2009 at 6:12pm.
What it 120+119+118+117+116...+2+1
Do it the mathematician's (Gauss) way: 1 + 2 + 3 + ..........+ 60 + 120 + 119 + 118 + 117 + ...+61 = 121 + 121 + 121 + 121 + ....(sixty times) Can you take it from here?
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