Talk:15 puzzle solver: Difference between revisions
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== Mathematical meaning of random ==
Unlike minimum, which I am surprised that anyone thinks means anything other than 'reduced to the least possible amount or degree', random means easy mathematically. There are 16!/2 15 puzzles, a little over 10 trillion, of which the number that are hard to solve is counted in the hundred thousands. Therefore a randomly chosen puzzle is easy. --[[User:Nigel Galloway|Nigel Galloway]] ([[User talk:Nigel Galloway|talk]]) 10:36, 6 October 2017 (UTC)--[[User:Nigel Galloway|Nigel Galloway]] ([[User talk:Nigel Galloway|talk]]) 10:36, 6 October 2017 (UTC)
== Extra credit for non-random puzzles ==
We could offer extra credit for solving hard puzzles:
<pre>
2 1 3 4
5 6 7 8
9 10 11 12
13 14 15 0
</pre>
and
<pre>
0 12 9 13
15 11 10 14
3 7 2 5
4 8 6 1
</pre>
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