RU-SPB 2009 Problem 92
- Grade 9
There are members of jury, that want to choose problem for contest. There are list with problems. They want to find such problem, that can be solved at least half members , but not all. Every member solved problems, and every two members solved different sets of problems. Prove, that they can find problem for contest.
Dataset text AI-MO AoPS. Quoted with source.
Solutions
No solution is on olymmath yet. Official and human solutions come first when they arrive. AI solutions come after them, with a label.
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