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by Jtsummers
500 days ago
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While it's not a true sudoku board, that invariant still holds. Whichever set of digits you end up using (it'll be the same 9 for rows, columns, and blocks) the sum will be same for all of them. It's also unique to the set of 9 numbers you end up using to solve the puzzle. If you use 1-9, sum is 45. For anything else, it's 45 - (the unused number). |
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