its impossible
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3x3 magic square 25 total
Sum = 3 x centre
There are a few ways to do it, i think. for a 3x3 board you go diagonaly up, then over right one.
Every number you put in it must add up to 15 vertically, horizontally and diagonally.
Excluding reflections and rotations, there is only one 3x3 magic square using 1-9.