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From: dparsons@jarthur.Claremont.EDU (Daniel Parsons)
Newsgroups: rec.games.frp,comp.sys.atari.st
Subject: Re: Right Way?????
Keywords: Which way??
Message-ID: <4117@jarthur.Claremont.EDU>
Date: 2 Feb 90 21:18:38 GMT
References: <25C9E532.8848@paris.ics.uci.edu>
Followup-To: rec.games.frp
Organization: Harvey Mudd College, Claremont, CA 91711
Lines: 33

In article <25C9E532.8848@paris.ics.uci.edu> wngai@ics.uci.edu (Wayne Ngai) writes:
>	Ok, you are in a Jungle and it is getting dark. You must find
>your way out of the jungle.  In the Jungle lived two tribes, one tribe
>is good and always tells the truth while the other tribe is bad and
>alway tells lies.  You are on a dirty path and came upon a Y-intersection.
>Right in front of you is a sign pointing right and reads "This way to
>Safty------->".  Behind the sign is a native, You can only ask him  
>one question with a yes or no Answer to determine if the native is telling the
> truth or lie and determine which way is the right way out of the jungle.
>Remember you are Allow to ask only one question and it must have a yes
>or no anwer.

	"If you were from the other tribe, would you tell me that this sign
really does point out the way to safety?"

If the safe path is path A, and the sign points down path A:
A truth-teller will say no, as he realizes the liar would lie.
A liar would also say no, as he would have to lie.

If the safe path is A, and the sign points down B:
A truth-teller will say yes, and a liar would also say yes.

	Whichever answer comes up, take it at it's opposite meaning.  In this 
situation you are combining a truth with a lie, which gives a lie, just as
1 * -1 = -1.  Hope this helps.

                                                            A  A  A  A
  . . . . .                                                -=--=--=--=-
.           .   @@//////////////@@@@@@@@@@@@@@@@@@@@@@@@@@|-^--^--^--^-\,,
 .       . . .:.@//////////////@@@@@@@@@@@@@@@@@@@@@@@@@@@|-v--v--v--v-/``
   . . .            The Mighty Mace of Self-Destruction    -=--=--=--=-
                                                            V  V  V  V
                                  Lord Daniel, dparsons@jarthur.claremont.edu