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From: wtm@ihuxb.UUCP (Bill Matern)
Newsgroups: net.puzzle
Subject: Re: Coin weighing puzzle & then some
Message-ID: <708@ihuxb.UUCP>
Date: Wed, 30-May-84 11:34:03 EDT
Article-I.D.: ihuxb.708
Posted: Wed May 30 11:34:03 1984
Date-Received: Fri, 1-Jun-84 06:26:41 EDT
References: <7280@umcp-cs.UUCP>
Organization: AT&T Bell Labs, Naperville, IL
Lines: 12

>You are given 12 coins and a balance.  Eleven of them are the same
>weight.  The other coin is either heavier or lighter.  Your mission,
>should you choose to accept it, is to discover which coin it is that
>has the non-standard weight, and whether it is heavier or lighter than
>the standard weight.  You can use the balance for comparing the weights
>of two different groups of coins.  You must accomplish this with three
>weighings or less.

Can you do it for 13 coins in which one is either heavier or
lighter if a 14th ball known to be good is provided???