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Re: 15 Number slide puzzle help
Posted by Sean A. Irvine on 7/11/2016, 8:20 pm, in reply to "15 Number slide puzzle help"
Yes, it is impossible (unless you take the pieces out and manually rearrange them). Half of all possible arrangements in such a puzzle are impossible. A parity argument can be used to show it is impossible. See 15 puzzle
for the mechanics of how to prove the impossibility.
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