The Ninth U.S.A. Mathematical Olympiad
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The Ninth U.S.A. Mathematical Olympiad was held on 6 May 1980. At the suggestion of members of the Olympiad Committee, the number of contestants was increased over previous years by adjusting the cutoff score from the Annual High School Mathematics Examination. As a result, 121 students (from over 400 000) were invited instead of the usual 100. In addi
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