1991 USAMO
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The 20th USAMO occurred April 23, 1991. There were five problems, and the time limit was three and a half hours.
Resources
| 1991 USAMO (Problems) | ||
| Preceded by 1990 USAMO | 1 • 2 • 3 • 4 • 5 | Followed by 1992 USAMO |
| All USAMO Problems and Solutions | ||
