Kakuro: sum 15 in 5 cells
A sum of 15 in 5 cells has exactly one digit set: 1+2+3+4+5.
| Combination | Digit set |
|---|---|
| 1 + 2 + 3 + 4 + 5 | 12345 |
What this tells you
- Unique. There is only one possibility, so as soon as you see this clue on a run of 5 cells you know the digits 1, 2, 3, 4, 5 go in it. Only their order is open, and crossing runs usually decide that.
- Digits that can never appear: 6, 7, 8, 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 30 in 4 cells (page).