Sample problems, information and links from multiple contests.
Organization that administers the AMC, the AIME, and the USAMO, with information about the contests, math problem archives, recommended reading lists, and other resources for students interested in mathematics.
links to contests, problem sets, journals sites.
Sponsors a number of competitions in the Australian continent.
Problem-solving journal at the senior secondary and university undergraduate levels.
Math Olympiad Problem Solving site with a weekly contest, resembling IMO in difficulty, with a large math forum and downloadable materials.
Results from the Putnam competition, old exams, and problem archives. Includes problem of the day, selected from over 540 different Putnam, National or International Olympiad problems.
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