Posted by john on Sunday, March 28, 2010 at 8:38pm.
70. I've always learned to draw a tree. You have two types of shoes (A and B). Then you have 5 pairs of pants (A through E) and 6 shirts (A through F). So when you draw a chain (aaa, aab, aac, aad, aae, aae, aaf, aba, etc) you end up with 70.
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