A mathematicians puzzle, what is the minimum number of clues in a Sudoku puzzle is required to produce a unique result? Someone spent years trying to solve it. The number is 17. See this article to discover how they figured it out.
There are exactly 6, 670, 903, 752, 021, 072, 936, 960 possible
solutions to Sudoku (about 10^21) . That’s far more than can be checked
in a reasonable period of time.
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