International Competitions 1991

#CompetitionYearsProblemsYears
1International Mathematical Olympiad1959–2025398
2Middle European Mathematical Olympiad2009–2025160
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ProblemSourceTags
International Mathematical Olympiad 1991 Problem 1International Mathematical Olympiad 1991GeometryIncircleInequalitiesOptimizationTriangle
International Mathematical Olympiad 1991 Problem 2International Mathematical Olympiad 1991NTPowersPrimesCoprime
International Mathematical Olympiad 1991 Problem 3International Mathematical Olympiad 1991CombinatoricsCountingCoprime
International Mathematical Olympiad 1991 Problem 4International Mathematical Olympiad 1991CombinatoricsConstructionGCDGraphs
International Mathematical Olympiad 1991 Problem 5International Mathematical Olympiad 1991AnglesGeometryInequalitiesTriangle
International Mathematical Olympiad 1991 Problem 6International Mathematical Olympiad 1991AlgebraConstructionInequalitiesSeq