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Combinatorics

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ProblemSourceTags
Middle European Mathematical Olympiad 2025 Problem I-2Middle European Mathematical Olympiad 2025BoardCombinatoricsOptimization
Middle European Mathematical Olympiad 2025 Problem T-1Middle European Mathematical Olympiad 2025CombinatoricsInequalitiesOptimization
Middle European Mathematical Olympiad 2025 Problem T-3Middle European Mathematical Olympiad 2025BoardCombinatoricsCountingOptimization
Middle European Mathematical Olympiad 2025 Problem T-4Middle European Mathematical Olympiad 2025CombinatoricsGraphsOptimization
Grade 9 2024 Problem 5Grade 9 2024AlgebraCombinatoricsCounting
Grade 9 2025 Problem 4Grade 9 2025BoardCombinatoricsTiling
Grade 9 2026 Problem 4Grade 9 2026CombinatoricsCountingTiling
Grade 10 2024 Problem 3Grade 10 2024CombinatoricsSquareTiling
Grade 10 2025 Problem 5Grade 10 2025BoardCombinatoricsCounting
Grade 10 2026 Problem 4Grade 10 2026CombinatoricsOptimizationTiling
Grade 11 2024 Problem 5Grade 11 2024CombinatoricsGames
Grade 11 2025 Problem 3Grade 11 2025CombinatoricsOptimizationTables
Grade 11 2026 Problem 5Grade 11 2026CombinatoricsEquilateralGames
Grade 12 2024 Problem 3Grade 12 2024CombinatoricsCountingTriangle
Grade 12 2025 Problem 5Grade 12 2025BoardColoringCombinatoricsOptimization
Grade 12 2026 Problem 5Grade 12 2026CombinatoricsGraphsOptimization