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Path: utzoo!linus!philabs!seismo!harpo!eagle!mhuxl!ulysses!princeton!eosp1!robison
From: robison@eosp1.UUCP
Newsgroups: net.puzzle
Subject: Re: pig puzzle
Message-ID: <348@eosp1.UUCP>
Date: Sun, 20-Nov-83 12:30:30 EST
Article-I.D.: eosp1.348
Posted: Sun Nov 20 12:30:30 1983
Date-Received: Tue, 22-Nov-83 00:17:04 EST
References: <259@ihuxt.UUCP>
Organization: Exxon Office Systems, Princeton, NJ
Lines: 18

The problem is to place 21 pigs in 4 pigpens so that each
contains an odd number of pigs.  There are many solutions
provided that some pigpens are wholly contained inside other
pens.  E.g., suppose that pigpen 1 is wholly inside pigpen
2.  Then place pigs as follows:

pen 1:  1 pig
pen 2:  10 pigs within pen 2, but outside pen 1.
pen 3:   3 pigs
pen 4    7 pigs.

Note that all four pens contain an odd number of pigs, because
pen 2 contains its 10 pigs, plus the pig in pen one.

				- Keremath,  care of:
				  Robison
			          decvax!ittvax!eosp1
				  or:   allegra!eosp1