Friday

February 27, 2015

February 27, 2015

Posted by **Teddie** on Friday, April 2, 2010 at 12:45pm.

dots are red and half are blue, and also in each column half are red and half are blue. Now,whenever two points of the same color are adjacent (in a row or column), join them by an edge

of that color. Show that the number of red edges is the same as the number of blue edges.

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