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Combinatorics

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Grade 9 2020 Problem 5Grade 9 2020CombinatoricsOptimization
Grade 9 2021 Problem 5Grade 9 2021CombinatoricsCubeOptimization
Grade 9 2022 Problem 5Grade 9 2022CombinatoricsCounting
Grade 9 2023 Problem 5Grade 9 2023CombinatoricsConstructionCounting
Grade 9 2025 Problem 5Grade 9 2025BoardCombinatoricsOptimization
Grade 9 2026 Problem 5Grade 9 2026BoardCombinatoricsTiling
Grade 10 1992 Problem 4Grade 10 1992CombinatoricsGeometry
Grade 10 1999 Problem 4Grade 10 1999AlgebraCombinatoricsSums
Grade 10 2001 Problem 3Grade 10 2001CombinatoricsCountingParity
Grade 10 2003 Problem 4Grade 10 2003CombinatoricsConstructionOptimization
Grade 10 2005 Problem 4Grade 10 2005CombinatoricsDivisibilityNT
Grade 10 2006 Problem 4Grade 10 2006CombinatoricsCountingTables
Grade 10 2009 Problem 5Grade 10 2009BoardCombinatoricsGames
Grade 10 2010 Problem 5Grade 10 2010BoardCombinatoricsParity
Grade 10 2011 Problem 5Grade 10 2011CombinatoricsCountingOptimization
Grade 10 2012 Problem 5Grade 10 2012BoardCombinatorics
Grade 10 2013 Problem 5Grade 10 2013BoardCombinatoricsConstruction
Grade 10 2014 Problem 5Grade 10 2014CombinatoricsCounting
Grade 10 2016 Problem 5Grade 10 2016BoardCombinatoricsTiling
Grade 10 2017 Problem 5Grade 10 2017ColoringCombinatoricsGraphs
Grade 10 2018 Problem 5Grade 10 2018BoardColoringCombinatorics
Grade 10 2019 Problem 5Grade 10 2019CombinatoricsGames
Grade 10 2020 Problem 5Grade 10 2020BoardColoringCombinatoricsTiling
Grade 10 2021 Problem 5Grade 10 2021Combinatorics
Grade 10 2022 Problem 4Grade 10 2022CombinatoricsCube3DTiling
Grade 10 2023 Problem 3Grade 10 2023CombinatoricsGeometryPolygonTriangle
Grade 10 2024 Problem 3Grade 10 2024CombinatoricsSquareTiling
Grade 10 2025 Problem 5Grade 10 2025BoardCombinatoricsCounting
Grade 10 2026 Problem 4Grade 10 2026CombinatoricsOptimizationTiling
Grade 10 2020 Problem 3Grade 10 2020ColoringCombinatoricsCounting
Grade 10 2020 Problem 7Grade 10 2020CombinatoricsCountingDigitsOptimization
Grade 10 2021 Problem 4Grade 10 2021CombinatoricsOptimizationTables
Grade 10 2023 Problem 7Grade 10 2023BoardCombinatoricsGames
Grade 10 2024 Problem 7Grade 10 2024CombinatoricsCountingGraphsOptimization
Grade 10 2025 Problem 7Grade 10 2025CombinatoricsCountingParityTables
Grade 10 2015 Problem 5Grade 10 2015CombinatoricsCounting
Grade 10 2016 Problem 5Grade 10 2016BoardColoringCombinatoricsGraphs
Grade 10 2017 Problem 5Grade 10 2017CombinatoricsDivisibilityNT
Grade 10 2018 Problem 5Grade 10 2018CombinatoricsDivisibilityNT
Grade 10 2019 Problem 5Grade 10 2019BoardCombinatoricsCountingOptimization
Grade 10 2020 Problem 5Grade 10 2020BoardCombinatoricsCounting
Grade 10 2021 Problem 5Grade 10 2021ColoringCombinatoricsPolygon
Grade 10 2023 Problem 5Grade 10 2023CombinatoricsGCDNTCoprime
Grade 10 2024 Problem 5Grade 10 2024CombinatoricsCountingDigits
Grade 10 2025 Problem 5Grade 10 2025BoardCombinatoricsOptimization
Grade 10 2026 Problem 5Grade 10 2026BoardCombinatoricsGamesOptimization
Grade 11 1992 Problem 4Grade 11 1992BoardCombinatoricsTiling
Grade 11 1995 Problem 3Grade 11 1995ColoringCombinatoricsGraphs
Grade 11 1999 Problem 4Grade 11 1999CombinatoricsModRemainders
Grade 11 2001 Problem 4Grade 11 2001CombinatoricsNTPrimes