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Combinations

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International Mathematical Olympiad 1974 Problem 3International Mathematical Olympiad 1974CombinationsDivisibilityModNT
International Mathematical Olympiad 1981 Problem 2International Mathematical Olympiad 1981CombinationsCombinatoricsCounting
International Mathematical Olympiad 2011 Problem 1International Mathematical Olympiad 2011CombinationsDivisibilityNTOptimization
Middle European Mathematical Olympiad 2013 Problem I-4Middle European Mathematical Olympiad 2013CombinationsDiophantineNT
Middle European Mathematical Olympiad 2018 Problem I-4Middle European Mathematical Olympiad 2018CombinationsInequalitiesNT
Grade 12 2003 Problem 4Grade 12 2003CombinationsDivisibilityNTPrimes
Grade 12 2022 Problem 6Grade 12 2022AlgebraCombinationsSums