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MathNet 1963 — Part 01 Question 14

Math Olympiad Vault · MathNet 1963 — Part 01

Question 14

Can we label each vertex of a 45-gon with one of the digits $0, 1, \ldots, 9$ so that for each pair of distinct digits $i, j$ one of the 45 sides has vertices labeled $i, j$?