Posted by Eugene Volokh: Math Puzzle: http://volokh.com/archives/archive_2009_05_10-2009_05_16.shtml#1242104377
Leonhard correctly finishes a [1]Sudoku puzzle, and tells you: "That's cool! When I look only at the upper left-hand 3 x 3 square of the puzzle, view each of the three-digit rows as a three-digit number, and add them together, I get 1000." Is he telling the truth? An alternative version, if you prefer: You correctly tell Blaise, "I have three three-digit numbers that add up to 1001, and all the digits of all the numbers are different from each other." Right away, Blaise says, "You didn�t use a 7 in any of them, right?" How did he know? Tell me, please, which version you like better. References 1. http://www.sudoku.com/howtoplay.html
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