How to make a magic square with the magic sum of -12?
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Again, this is sort of a magic square - each row, column or diagonal adds up to 60. To get a proper 12x12 magic square, using the numbers 1 to 144 each exactly once, we have to do some arithmetic.
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First, prepare a magic square with a sum of 15. Then we are going to subtract -27 from the sum to obtain -12.
If we are going to subtract -27 from the magic sum, we can subtract -9 from each number.
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