Wiki http://en.wikipedia.org/wiki/Mathematics_of_Sudoku http://en.wikipedia.org/wiki/Mathematics_of_Sudoku说数独有 6,670,903,752,021,072,936,960 种可能的排列。我试图找出答案,但似乎很难。有人可以告诉我这个数字是如何计算的吗?
您可以在这个 Wiki 中找到所有相关信息:http://en.wikipedia.org/wiki/Mathematics_of_Sudoku http://en.wikipedia.org/wiki/Mathematics_of_Sudoku.
"the number of valid Sudoku solution grids for the standard 9×9 grid was calculated by Bertram Felgenhauer and Frazer Jarvis in 2005 to be 6,670,903,752,021,072,936,960 . This number is equal to 9! × 722 × 27 × 27,704,267,971, the last factor of which is prime. The result was derived through logic and brute force computation."