Apr. 25th, 2011

lederhosen: (Default)
The problem I posted a couple of days ago:

An 8 by 8 square is painted white. We are allowed to choose any rectangle consisting of 3 of the 64 (1 by 1) squares and paint each of the 3 squares in the opposite colour (the white ones black, the black ones white). Is it possible to paint the entire square black by means of such operations?


Solution below the cut. )
lederhosen: (Default)
Yesterday our D&D group actually did something competent!

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