Kakuro: sum 9 in 2 cells
A sum of 9 in 2 cells can be made 4 ways.
| Combination | Digit set |
|---|---|
| 1 + 8 | 18 |
| 2 + 7 | 27 |
| 3 + 6 | 36 |
| 4 + 5 | 45 |
What this tells you
- There are 4 possibilities, so this clue alone does not decide the digits. Use crossing runs and any known cells to eliminate combinations.
- Digits that can never appear: 9. You can remove them from every cell of the run.
Related sums
The digits left out of each combination form a combination for the mirror run: sum 36 in 7 cells.
Sum 9 is also possible in 3 cells.