Naked Science Forum
General Science => General Science => Topic started by: david hutchinson on 23/05/2011 11:01:04
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david hutchinson asked the Naked Scientists:
how many permutations are there in a sudoko grid?
What do you think?
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There are 5,472,730,538 unique sudoko arrangements. Each of these can be made into a thousand or so more by row changes, column changes and rotations (ie you can always swap row 1 and row 3 and have a valid solution).
It is currently thought you need at least 17 numbers to uniquely specify the grid
The Number Mysteries - Marcus Du Sautoy page 163