USAMO 1989 Problem 2
- Day 1
- Difficulty band 7
The 20 members of a local tennis club have scheduled exactly 14 two-person games among themselves, with each member playing in at least one game. Prove that within this schedule there must be a set of 6 games with 12 distinct players.
Dataset text AI-MO AoPS. Quoted with source.
Solutions
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