The Magic Nine, or the Puzzle of Fifteen
To arrange the numbers 1 to 9 in three rows, so that the sum of each row added together horizontally, vertically, or diagonally shall be 15. Fig. 5 shows how the arrangement has to be made.
| 8 | 30 | 27 | 10 | 25 | 11 |
| 35 | 6 | 33 | 34 | 1 | 2 |
| 17 | 13 | 22 | 21 | 24 | 14 |
| 20 | 19 | 16 | 15 | 18 | 23 |
| 5 | 31 | 4 | 3 | 36 | 32 |
| 26 | 12 | 9 | 28 | 7 | 29 |