KöMaL 2025 C1870
A table tennis competition is held between 10 contestants. Each contestant plays exactly one match against every other contestant. At one of the breaks the organizers observe that if two contestants played the same number of matches so far, then there is no contestant that played with both of them. Supposing that more than 5 matches had already been played until the break, is there a contestant who played exactly two matches so far?
Official text KöMaL. Quoted with source.
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