A normal 3x3 magic square has a sum of 15. So you subtract 3 from each number in the square.
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If you have three cells in a row, column, or diagonal, and you know the sum of each, you can find the fourth.
Assuming a 3x3 square, yes. If you want to know a solution where all rows, columns and diagonals sum to 15, it is: 2 9 4 7 5 3 6 1 8
It's not. Take 49 and 16 for example. The square root of the sum is the square root of 65. The sum of the square roots is 11.
sum of 14th square number and 10th square number
3x3=9 5+4=9 9-9=0