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From: abeles@mhuxm.UUCP (J. Abeles (Bellcore, Murray Hill, NJ))
Newsgroups: net.puzzle
Subject: Re: Forked Road logic puzzle (SPOILER)
Message-ID: <502@mhuxm.UUCP>
Date: Thu, 2-Jan-86 18:23:59 EST
Article-I.D.: mhuxm.502
Posted: Thu Jan  2 18:23:59 1986
Date-Received: Fri, 3-Jan-86 05:33:06 EST
References: <602@hou2f.UUCP>
Organization: AT&T Bell Laboratories, Murray Hill
Lines: 17

> >You can find out which way to go by asking either one of them ONE certain
> >question. What is the ONE question?
> 
> "Would your companion say that path #1 is correct, if asked?"
> (If path #1 is correct, both liar and truth-teller would say NO.
> If path #2 is correct, both would say YES).

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?