Kakuro: sum 15 in 4 cells
A sum of 15 in 4 cells can be made 6 ways.
| Combination | Digit set |
|---|---|
| 1 + 2 + 3 + 9 | 1239 |
| 1 + 2 + 4 + 8 | 1248 |
| 1 + 2 + 5 + 7 | 1257 |
| 1 + 3 + 4 + 7 | 1347 |
| 1 + 3 + 5 + 6 | 1356 |
| 2 + 3 + 4 + 6 | 2346 |
What this tells you
- There are 6 possibilities, so this clue alone does not decide the digits. Use crossing runs and any known cells to eliminate combinations.
- Every digit from 1 to 9 appears in at least one combination, so there is nothing to exclude outright.
Related sums
The digits left out of each combination form a combination for the mirror run: sum 30 in 5 cells (page).