Fun with num3ers
Saturday, April 23, 2011
Dominoes
Prove: if we remove two opposite corners from the chessboard, the board cannot be covered by dominoes. (Each dominoe covers two neighboring cells of the chessboard.)
Look for an “Ah-ha” proof: clear, convincing, no cases to distinguish.
http://people.cs.uchicago.edu/~laci/REU07/reupuzzles1.pdf
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