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From: alatto@bbncc5.UUCP (Andrew Latto)
Newsgroups: net.puzzle
Subject: Re: Forked Road logic puzzle (SPOILER)
Message-ID: <897@bbncc5.UUCP>
Date: Tue, 7-Jan-86 10:49:37 EST
Article-I.D.: bbncc5.897
Posted: Tue Jan  7 10:49:37 1986
Date-Received: Thu, 9-Jan-86 05:23:16 EST
References: <602@hou2f.UUCP> <502@mhuxm.UUCP>
Reply-To: alatto@bbncc5.UUCP (Andrew Latto)
Organization: Bolt Beranek and Newman, Cambridge, MA
Lines: 19

In article <502@mhuxm.UUCP> abeles@mhuxm.UUCP (J. Abeles (Bellcore, Murray Hill, NJ)) writes:
>
>New quiz:
>
>You are lost on an island populated with three "tribes:"
>The first always answers the opposite of the truth,
>the second always answers the truth,
>and the third answers randomly.
>
>(You can only ask simple yes-no questions)
>
>How can you determine which road to take in only two questions?

The problem is misstated, and insoluble, as stated. You must also know
that there are three people at the junction of the roads, one from each
tribe. I believe that you must also assume that each of the three of them
knows what tribe each of the others belongs to.
a						Andy Latto
						alatto@bbn.ARPA