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From: 4341fah@houxn.UUCP
Newsgroups: net.puzzle
Subject: Re: Coin weighing puzzle & then some
Message-ID: <511@houxn.UUCP>
Date: Thu, 31-May-84 09:14:46 EDT
Article-I.D.: houxn.511
Posted: Thu May 31 09:14:46 1984
Date-Received: Sat, 2-Jun-84 09:34:24 EDT
References: <7280@umcp-cs.UUCP>, <708@ihuxb.UUCP>
Organization: AT&T Information Systems, Holmdel NJ
Lines: 9


you can find the bad (heavier or lighter) coin of thirteen with three
weighings without a fourteenth "good" coin - after one weighing you
know where at least 4 "good" coins are.

The only hitch here is that for 1 of the 13 cases you won't know if the
"bad" coin is heavier or lighter after 3 weighings - only that it's "bad"!

Fred Hicinbothem