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MathNet 2025-part-01 — 187 problems (EN–VI) Question 95

Math Olympiad Vault · MathNet 2025-part-01 — 187 problems (EN–VI)

Question 95

As shown in the figure, seven regular hexagonal cells form a hexagonal pattern. We write one integer from $1$ to $7$ in each cell without repetition. For any two cells that share an edge, the sum of the integers written in those cells must be at most $10$. How many ways are there to write the integers under these conditions?

Note that two labelings that coincide by rotation or reflection are counted as distinct ways.

Question illustration