Enumeration Results
The number of ways of filling in a blank Sudoku grid was shown in May 2005 to be 6,670,903,752,021,072,936,960 (~6.67×1021) (original announcement ). The paper 'Enumerating possible Sudoku grids', by Felgenhauer and Jarvis, describes the calculation.
Since then, enumeration results for many Sudoku variants have been calculated: these are summarised below.
Read more about this topic: Mathematics Of Sudoku
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