The classical 8-puzzle belongs to the family of sliding blocks. My book (Artificial intelligence A modern approach by Stuart Russell and peter Norwig) says that the 8-puzzle has 9!/2 possible states. But WHY the /2 ? How do you get this?
How many possible states does the 8-puzzle have?
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9!is the total number of possible configurations of the puzzle, whereas9!/2is the total number of solvable configurations. For example, this configuration doesn't have a solution:Read more about the solvability of certain configurations of the n-puzzle in this Wikipedia article, or as pointed out by @dasblinkenlight in this MathWorld explanation.
One possible way to find out that
9!/2is the number of solvable configurations is to start from a solved puzzle and generate all the possible valid, non-repeating movements from it.