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More or less magic square (Posted on 2004-06-22) Difficulty: 3 of 5
Fill a 3x3 square with the numbers from 1 to 9, so the four sides and the two diagonals share the same sum, which is to be as large as possible.

See The Solution Submitted by Federico Kereki    
Rating: 3.2500 (4 votes)

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Solution A solution greater than 15 | Comment 1 of 11
 6  5  7
4 3 2 = 18
8 1 9

This is the only square with sides and diagonals equal to each other.  There are, of course, reflections and rotations of this square.

  Posted by Erik O. on 2004-06-22 09:24:52
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