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May 18, 2011 at 19:35 comment added Len Schrieber I'd just like to add that it's true enough that this question is not quite appropriate for MO; but still, judging from the number of views it has received, even serious mathematicians like to relax once in a while with an elementary problem!
May 16, 2011 at 18:13 history answered Aaron Meyerowitz CC BY-SA 3.0