Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Posting-Version: version B 2.10.1 6/24/83 SMI; site ur-laser.uucp
Path: utzoo!linus!philabs!cmcl2!seismo!rochester!ur-laser!james
From: james@ur-laser.uucp (James Chavin)
Newsgroups: net.math
Subject: a logic brain teaser
Message-ID: <219@ur-laser.uucp>
Date: Mon, 20-Aug-84 15:20:24 EDT
Article-I.D.: ur-laser.219
Posted: Mon Aug 20 15:20:24 1984
Date-Received: Wed, 22-Aug-84 02:49:40 EDT
Organization: Lab for Laser Energetics, Univ. of Rochester
Lines: 30


    You are Dorothy on the way to the Wonderful Wizard of Oz.  One day, while 
gaily skipping along the yellow brick road, you come to fork, one path leading 
north and another one west.  Unfortunately, you don't know which path leads to 
Oz and which path leads to /dev/null. 
    Between the fork lies a quaint old cottage.  In this cottage there live two
identical witches.  One witch always tells the truth while the other witch
never tells the truth.  Both witches know the way to Oz, and have graciously
granted you one question to ask one of them.  You must consider your choice of 
question carefully, for there must be no doubt as to the correct way to Oz.  A 
question such as 'Which way to Oz?' is obviously useless, as you will not know 
whether you asked the truthful or the deceitful witch.  The problem is not to 
guess the correct way, but to ask the correct question so that regardless of
which hag is asked, the same path would be indicated.


    Mail your questions to James Chavin
                           {allegra,seismo} !rochester!ur-laser!james
                           Gary Krakower
  
    We will reply promptly, and post the correct question to the net Monday, 
August 27.

    Have fun!!!!!!!!!!!!!
 
--------------------------------------------------------------------------------

    X-rays let you see your soul 

--------------------------------------------------------------------------------