10 Aug 2000 bwtaylor   » (Journeyer)

I got an email from an old friend today. Ah, there is nothing better. Here's a fun puzzle for whoever wants it:

The 12 Coins Problem

There are 12 coins, all identical in appearance, and all indentical in weight except for one, which is either heavier or lighter than the remaining 11 coins. Devise a procedure to identify the counterfeit coin in only 3 weighings with a balance.

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