Question
Use digits $1$ to $9$ only. Use each digit once in such a way that each row, each column makes a sum of $18.$
| $9$ | ||
| $6$ | ||
| $3$ |
| $9$ | ||
| $6$ | ||
| $3$ |
| 6 | 3 | $9$ |
| 9 | $6$ | 3 |
| $3$ | 9 | 6 |
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| $5$ | ||
| $4$ | ||
| $3$ |
| $8$ | ||
| $5$ | ||
| $2$ |
| $9$ | ||
| $7$ | ||
| $5$ |