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From: gwyn@brl-tgr.ARPA (Doug Gwyn <gwyn>)
Newsgroups: net.math
Subject: Re: Wanted: Solution to kids puzzle
Message-ID: <3388@brl-tgr.ARPA>
Date: Wed, 18-Jul-84 22:28:18 EDT
Article-I.D.: brl-tgr.3388
Posted: Wed Jul 18 22:28:18 1984
Date-Received: Fri, 20-Jul-84 07:22:21 EDT
References: <6100006@hp-pcd.UUCP>
Organization: Ballistics Research Lab
Lines: 2

A position in the "15" puzzle is realizable if and only if it
is an even permutation of the starting position.