Maths Puzzle Solution

tickYesterday we challenged you to place the digits from 1 to 9 into a 3 x 3 grid so that each row, column and diagonal added up to 15. There were a number of possible solutions.

5 must always be in the center square.

Place the 1 in any middle-edge square.

But now, you must place the 9 opposite it.

Notice that there are two other odd numbers, 3 and 7. They must make a row, column or diagonal with the 5, and they can’t be paired with an even number. Also, 7 cannot be on a row or column with 9.

So 3 and 7 must go on the other two middle-edge squares.

Then, 2, 4, 6 and 8 may be easily filled in to complete the square.

Your solution should look like this:

8 3 4
1 5 9
6 7 2

2 9 4
3 5 7
6 1 8

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