Medium Combinatorics Interview Questions
Medium is where most real interview questions sit. This is the combinatorics set worth spending the most time in.
82 questions, 48 of them free to practise right now.
- A prime sum on prime diceMediumProbabilityCombinatoricsView →
- An ace for everyoneMediumProbabilityCombinatoricsView →
- An ace in every pileMediumProbabilityCombinatoricsView →
- Anagrams of LOLLIPOPMediumCombinatoricsView →
- Balanced parenthesesMediumCombinatoricsProgramming & DSAView →
- Boy–girl neighbors in a lineMediumCombinatoricsExpected ValueView →
- Chords that don't crossMediumProbabilityCombinatoricsView →
- Deleting every other number on a circleMediumCombinatoricsBrainteasersView →
- Distinct die labelingsMediumCombinatoricsBrainteasersView →
- Distributing candies with a capMediumCombinatoricsView →
- Eight dice summing to twelveMediumProbabilityCombinatoricsView →
- Emptying the cherry bowlMediumProbabilityCombinatoricsView →
- Exactly two aces in a bridge handMediumProbabilityCombinatoricsView →
- First HH on the tenth tossMediumProbabilityCombinatoricsView →
- Full housesMediumProbabilityCombinatoricsView →
- Keeping two apartMediumCombinatoricsView →
- Lattice paths in 3DMediumCombinatoricsView →
- Median of a list and its squaresMediumCombinatoricsStatisticsView →
- Monotone paths across a gridMediumCombinatoricsView →
- No face card before the two of heartsMediumProbabilityCombinatoricsView →
- No two evens adjacentMediumCombinatoricsView →
- No two neighboring bulbs litMediumProbabilityCombinatoricsView →
- Non-attacking rooksMediumCombinatoricsView →
- Odd multiples of threeMediumCombinatoricsBrainteasersView →
- Odd solutions to a sumMediumCombinatoricsView →
- One card each in casino warMediumProbabilityCombinatoricsView →
- One random subset inside anotherMediumProbabilityCombinatoricsView →
- Placing operators among digitsMediumCombinatoricsView →
- Probability of three of a kindMediumProbabilityCombinatoricsView →
- Red faces on a diced cubeMediumCombinatoricsExpected ValueView →
- Regions from ten linesMediumCombinatoricsBrainteasersView →
- Sum of multinomial coefficientsMediumCombinatoricsView →
- Sum of the pandigital numbersMediumCombinatoricsBrainteasersView →
- Summing digits to a millionMediumCombinatoricsBrainteasersView →
- Ten dice, sum divisible by sixMediumProbabilityCombinatoricsView →
- Terms in a multinomial expansionMediumCombinatoricsView →
- The birthday problemMediumProbabilityCombinatoricsView →
- The die that makes sums uniformMediumProbabilityCombinatoricsView →
- The largest unmakeable totalMediumCombinatoricsBrainteasersView →
- The same number of tailsMediumProbabilityCombinatoricsView →
- The third shiny pennyMediumProbabilityCombinatoricsView →
- Three dots on a squareMediumProbabilityCombinatoricsView →
- Three ones in a rowMediumProbabilityCombinatoricsView →
- Three-four-five in Pascal's triangleMediumCombinatoricsBrainteasersView →
- Tiling a stripMediumCombinatoricsView →
- Trailing zeros of 100!MediumCombinatoricsView →
- Units digit of a random powerMediumProbabilityCombinatoricsView →
- Variance of hearts in eight cardsMediumCombinatoricsStatisticsView →
- A family clustered at a round tableMediumCombinatorics Premium
- A relay team with a feudMediumCombinatorics Premium
- Aces in a seven-card handMediumCombinatoricsExpected Value Premium
- An ace in the handMediumProbabilityCombinatorics Premium
- Climbing stairsMediumCombinatoricsProgramming & DSA Premium
- CompositionsMediumCombinatorics Premium
- Counting straightsMediumProbabilityCombinatorics Premium
- Derangements of four itemsMediumCombinatorics Premium
- Distinct faces in five rollsMediumCombinatoricsExpected Value Premium
- Eight coins, one lightMediumCombinatoricsBrainteasers Premium
- Expected ascents in a shuffleMediumCombinatoricsExpected Value Premium
- Five distinct ranksMediumProbabilityCombinatorics Premium
- Four distinct birth monthsMediumProbabilityCombinatorics Premium
- Identical balls, no empty boxMediumCombinatorics Premium
- Inversions in a shuffleMediumCombinatoricsExpected Value Premium
- Keeping a couple togetherMediumCombinatorics Premium
- Large sum given a sixMediumProbabilityConditional Probability & Expectation Premium
- Last two digits of a powerMediumCombinatoricsBrainteasers Premium
- Math books stay togetherMediumCombinatorics Premium
- No two heads in a rowMediumProbabilityCombinatorics Premium
- Onto functionsMediumCombinatorics Premium
- Pair at a round tableMediumCombinatorics Premium
- Pairing up six peopleMediumCombinatorics Premium
- Paths dodging a closed intersectionMediumCombinatorics Premium
- Paths on a 4×3 gridMediumCombinatorics Premium
- Position of the first spadeMediumCombinatoricsExpected Value Premium
- Power of three in a factorialMediumCombinatorics Premium
- Spaced onesMediumCombinatorics Premium
- Squares on a chessboardMediumCombinatoricsBrainteasers Premium
- Subsets with no neighborsMediumCombinatorics Premium
- Sum of 10 with three diceMediumProbabilityCombinatorics Premium
- The two black aces, side by sideMediumProbabilityCombinatorics Premium
- Three unlabeled teamsMediumCombinatorics Premium
- Two face cardsMediumProbabilityCombinatorics Premium
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