1982 USAMO Problems/Problem 1
Problem
In a party with 
persons, among any group of four there is at least one person who knows each of the other three. What is the minimum number of people in the party who know everyone else.
Solution
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See Also
| 1982 USAMO (Problems • Resources) | ||
| Preceded by First Question |
Followed by Problem 2 | |
| 1 • 2 • 3 • 4 • 5 | ||
| All USAMO Problems and Solutions | ||
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