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Want to learn how to tackle those tough MATHCOUNTS and AMC counting and probability problems? Check out Art of Problem Solving's Introduction to Counting & Probability by David Patrick.

1998 USAMO

From AoPSWiki

The 1998 USAMO problems. There were 6 problems total, to be completed over a period of 2 days, 3 problems per day, four and a half hours per day.

Want to learn how to tackle those tough MATHCOUNTS and AMC counting and probability problems? Check out Art of Problem Solving's Introduction to Counting & Probability by David Patrick.
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