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From: ark@rabbit.UUCP (Andrew Koenig)
Newsgroups: net.puzzle
Subject: A different balls-in-bowl puzzle
Message-ID: <2514@rabbit.UUCP>
Date: Wed, 15-Feb-84 11:28:39 EST
Article-I.D.: rabbit.2514
Posted: Wed Feb 15 11:28:39 1984
Date-Received: Fri, 17-Feb-84 04:54:07 EST
Organization: AT&T Bell Laboratories, Murray Hill
Lines: 12

You have a bowl in front of you with a number of black and
white marbles in it.  You now repeat the following step:

	Remove two marbles from the bowl.  If they are the same
	color, put a white marble back.  If they are different colors,
	put a black marble back.

You have a sufficient supply of extra white marbles to accomplish this.
Since each step removes two marbles and replaces one, you will eventually
wind up with only a single marble in the bowl.  What color is it?
The answer is a function of the number of marbles of each color
that were originally in the bowl.