Sudoku. Tutorial #19 Solving using Arithmetic

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It is often said that solving sudoku puzzles has nothing to do with mathematics. Well it is possible to use arithmetic, however I don't recommend it particularly for very hard puzzles.
The important fact to remember when using arithmetic is that every row, column and block must add up to 45.

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Видео Sudoku. Tutorial #19 Solving using Arithmetic канала Sudoku Guy