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The sum of each row (or column or square) is 45. There are 9 such rows (or columns or squares) So grand total = 45*9 = 405
there is no real satistics to a sudoku so unluky the are many ways to do a sudoku
It doesn't look as if Euler was involved with the invention of Sudoku. http://en.wikipedia.org/wiki/Sudoku#History
No, you can do Sudoku with letters or shapes sometimes. You don't actually have to add or subtract or do math calculations when playing it.
Sudoku