math
us ing each of the digits 1 to 9 once only, write one digit in each square so that each line vertically, horizontally and diagonally has the same total. thanks
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6 2 7 1 5 9 3 8 4 In this example of a "magic square," all of the rows, columns, and diagonals add up to the same sum. In this case, the sum is 15. The correct placement of the numbers is above. The sum of each row, column and diagonal is equal to 15: 6 + 2 + 7 = 15, 1 + 5 + 9 = 15, 3 + 8 + 4 = 15, 6 + 1 + 3 = 15, 2 + 5 + 8 = 15, 7 + 9 + 4 = 15, 6 + 5 + 4 = 15 and 7 + 5 + 3 = 15.
