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MathNet 2021 — Part 03 Question 36

Math Olympiad Vault · MathNet 2021 — Part 03

Question 36

We consider sports tournaments with $n \ge 4$ participating teams and where every pair of teams plays against one another at most one time. We call such a tournament *balanced* if any four participating teams play exactly three matches between themselves. So, not all teams play against one another.
Determine the largest value of $n$ for which a balanced tournament with $n$ teams exists.