Answer to this week's riddle
Travis Hale Again, the riddle:
There are 5,472,730,538 variants of what popular pastime? One a day just isn't going to cut it… Answer: According to recent scholarship, there are 5,472,730,538 "essentially different: Sudoku grids. Source: http://www.afjarvis.staff.shef.ac.uk/sudoku/sudgroup.html
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