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math puzzle
http://mathforum.org/kb/thread.jspa?messageID=7954332&tstart=0#7954332
This year, 2013, all the digits of the year are different. When was the last time we had a year like this?
(It's]]>
Jan 3, 2013 4:40:52 PM
Jan 3, 2013 4:40:52 PM
eromer
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