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Path: utzoo!watmath!clyde!burl!ulysses!mhuxl!ihnp4!ihuxe!rainbow
From: rainbow@ihuxe.UUCP
Newsgroups: net.puzzle
Subject: RE:coin weighing puzzle
Message-ID: <643@ihuxe.UUCP>
Date: Wed, 30-May-84 12:11:04 EDT
Article-I.D.: ihuxe.643
Posted: Wed May 30 12:11:04 1984
Date-Received: Fri, 1-Jun-84 06:30:23 EDT
Sender: rainbow@ihuxe.UUCP
Organization: AT&T Bell Labs, Naperville, IL
Lines: 6

Question:How to find the counterfeit coin in a group of 12 given that it
         weighs differently. At your disposal is one balance usable 3 times.
         Also determine if it weighs more or less than the standard.
Answer:The key to the solution is to wiegh four opposite four the first time.
       This narrows the pile with the counterfeit coin down to four. Now just
       weigh the first two and the last two seperately to narrow it down to one