Combinatorics Interview Questions
Counting cleanly is a quant superpower. These combinatorics questions cover permutations, combinations, and inclusion–exclusion that show up across probability problems.
64 combinatorics questions · 29 free to practise now.
- 1 before 2EasyProbabilityCombinatoricsView →
- Aces in a five-card handEasyCombinatoricsExpected ValueView →
- All-distinct PINEasyProbabilityCombinatoricsView →
- Anagrams of BANANAEasyCombinatoricsView →
- Counting people from handshakesEasyCombinatoricsView →
- Diagonals of a polygonEasyCombinatoricsView →
- Divisible by 3 or 5EasyCombinatoricsView →
- Drawing a pairEasyProbabilityCombinatoricsView →
- Even-size subsetEasyProbabilityCombinatoricsView →
- Even-weight stringsEasyCombinatoricsView →
- Exactly five headsEasyProbabilityCombinatoricsView →
- First ace before first kingEasyProbabilityCombinatoricsView →
- Fixed points of a shuffleEasyCombinatoricsExpected ValueView →
- Handshakes in a roomEasyCombinatoricsView →
- Hopping rabbitEasyProbabilityCombinatoricsView →
- Lottery drawEasyProbabilityCombinatoricsView →
- Picking a committeeEasyCombinatoricsView →
- Pigeonhole by monthEasyCombinatoricsBrainteasersView →
- Probability two dice sum to 7EasyProbabilityCombinatoricsView →
- Round tableEasyCombinatoricsView →
- Scoops with repetitionEasyCombinatoricsView →
- SubsetsEasyCombinatoricsView →
- Three dice, increasingEasyProbabilityCombinatoricsView →
- Triangles from pointsEasyCombinatoricsView →
- Anagrams of MISSISSIPPIMediumCombinatoricsView →
- Lattice pathsMediumCombinatoricsView →
- The birthday problemMediumProbabilityCombinatoricsView →
- Trailing zeros of 100!MediumCombinatoricsView →
- Two aces drawnMediumProbabilityCombinatoricsView →
- An ace in every pileMediumProbabilityCombinatorics Premium
- Climbing stairsMediumCombinatoricsProgramming & DSA Premium
- Committee with a chairMediumCombinatorics Premium
- CompositionsMediumCombinatorics Premium
- Counting flushesMediumProbabilityCombinatorics Premium
- Counting straightsMediumProbabilityCombinatorics Premium
- Distributing identical candiesMediumCombinatorics Premium
- Eight coins, one lightMediumCombinatoricsBrainteasers Premium
- Full housesMediumProbabilityCombinatorics Premium
- Inversions in a shuffleMediumCombinatoricsExpected Value Premium
- Keeping two apartMediumCombinatorics Premium
- Large sum given a sixMediumProbabilityConditional Probability & Expectation Premium
- Nine coins, one heavyMediumCombinatoricsBrainteasers Premium
- No two heads in a rowMediumProbabilityCombinatorics Premium
- Non-attacking rooksMediumCombinatorics Premium
- Onto functionsMediumCombinatorics Premium
- Pair at a round tableMediumCombinatorics Premium
- Power of three in a factorialMediumCombinatorics Premium
- Spaced onesMediumCombinatorics Premium
- Subsets with no neighborsMediumCombinatorics Premium
- Sum of 10 with three diceMediumProbabilityCombinatorics Premium
- Three distinct diceMediumProbabilityCombinatorics Premium
- Three dots on a squareMediumProbabilityCombinatorics Premium
- Tiling a stripMediumCombinatorics Premium
- A void suit in bridgeHardProbabilityCombinatorics Premium
- Ages from product and sumHardCombinatoricsBrainteasers Premium
- Balanced parenthesesHardCombinatoricsProgramming & DSA Premium
- Cycles in a shuffleHardCombinatoricsExpected Value Premium
- Defective stack of coinsHardCombinatoricsBrainteasers Premium
- Exactly one pairHardProbabilityCombinatorics Premium
- Handshakes at a dinner partyHardCombinatoricsBrainteasers Premium
- Making change in lineHardCombinatoricsStochastic Processes Premium
- The boy born on a TuesdayHardProbabilityConditional Probability & Expectation Premium
- Three unlabeled teamsHardCombinatorics Premium
- Two-color necklacesHardCombinatorics Premium
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