The USA TST, or USA Team Selection Test, is a test administered to the top 12 (or occasionally 13) scorers on the USAMO. The results are used to determine the team that is sent to the IMO. Nowadays, it consists of 9 problems over 3 days, though it used to follow the same format as the USAMO (6 questions over 2 days). The questions (especially recently) are also harder than respectively problems on the USAMO, usually.
Problem 1/4/7: 7
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