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Path: utzoo!linus!philabs!cmcl2!floyd!clyde!ihnp4!ihuxl!klutz
From: klutz@ihuxl.UUCP ()
Newsgroups: net.puzzle
Subject: Re: three spies
Message-ID: <661@ihuxl.UUCP>
Date: Sun, 16-Oct-83 16:20:02 EDT
Article-I.D.: ihuxl.661
Posted: Sun Oct 16 16:20:02 1983
Date-Received: Mon, 17-Oct-83 23:33:05 EDT
References: <387@ihuxe.UUCP>
Organization: AT&T Bell Labs, Naperville, Il
Lines: 12

1) If the first man knew, both of the other two spies hats would be
   white; therefore, they are not both white. (They were either
   half and half or both black)

2) Thus, if the second man sees a white hat on the third man, his
   would then be black. But he didn't know.

3) Therefore the third man knows his hat is black.

			Sherwin Clutter
			AT&T-BL - Naperville, IL
			ihuxl!klutz