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July 20, 2011 02:57 pm PDT
Original Link: http://feeds.boingboing.net/~r/boingboing/iBag/~3/2I2SWXUzbOE/counterfeit-coin-puz.html
Counterfeit coin puzzle
Futility closet has a good brain teaser: You have nine coins and a balance scale. One of the coins is lighter than the others. Is it possible to identify it in only two weighings? J.E. Littlewood observes that a similar puzzle wasted 10,000 scientist-hours of work during World War II. "There was a proposal to drop it over Germany." Counterfeit coin puzzle...
Original Link: http://feeds.boingboing.net/~r/boingboing/iBag/~3/2I2SWXUzbOE/counterfeit-coin-puz.html
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