Jane Street Quant Interview Questions
Jane Street's trading and research interviews are known for probability, expected value, and fast mental arithmetic, alongside market-making and betting-game scenarios that test how you price and manage risk under uncertainty.
168 questions tagged to Jane Street · 24 free to practise now.
- Anagrams of BANANAEasyCombinatoricsView →
- Binary tree traversal orderEasyProgramming & DSAView →
- Chebyshev's boundEasyStatisticsView →
- Determinant of a productEasyLinear AlgebraView →
- Eigenvalue of a matrix powerEasyLinear AlgebraView →
- Even-weight stringsEasyCombinatoricsView →
- First ace before first kingEasyProbabilityCombinatoricsView →
- Fixed points of a shuffleEasyCombinatoricsExpected ValueView →
- Limit of sin x over xEasyCalculusView →
- Maximum subarray sumEasyProgramming & DSAView →
- Partial derivative at a pointEasyCalculusView →
- Spectrum of a triangular matrixEasyLinear AlgebraView →
- Stack-based parenthesis matchingEasyProgramming & DSAView →
- Sum of geometric series (ratio 1/3)EasyCalculusView →
- The memoryless propertyEasyProbabilityRandom VariablesView →
- Trace from the spectrumEasyLinear AlgebraView →
- Two-sum existenceEasyProgramming & DSAView →
- 25 horses, 5 tracksMediumBrainteasersView →
- Lattice pathsMediumCombinatoricsView →
- Monty HallMediumProbabilityConditional Probability & ExpectationView →
- The birthday problemMediumProbabilityCombinatoricsView →
- Two childrenMediumProbabilityConditional Probability & ExpectationView →
- Two guards, two doorsMediumBrainteasersView →
- Two ropes, 45 minutesMediumBrainteasersView →
- An ace in every pileMediumProbabilityCombinatorics Premium
- Attributing a superposed Poisson eventMediumProbabilityStochastic Processes Premium
- Best linear blend of two estimatesMediumRandom VariablesStatistics Premium
- Climbing stairsMediumCombinatoricsProgramming & DSA Premium
- Clock hands overlapMediumBrainteasers Premium
- CompositionsMediumCombinatorics Premium
- Continuously compounded growthMediumFinance & Derivatives Premium
- Convergence of the integral of x^(-p)MediumCalculus Premium
- Count set bitsMediumProgramming & DSA Premium
- Coupon collector as a Markov chainMediumExpected ValueStochastic Processes Premium
- Definite integral of x e^x on [0,1]MediumCalculus Premium
- Density of a uniform squaredMediumRandom VariablesCalculus Premium
- Derivative of xˣMediumCalculus Premium
- Distributing identical candiesMediumCombinatorics Premium
- Double integral of x + y over the unit squareMediumCalculus Premium
- Eigenvalues of a projectionMediumLinear Algebra Premium
- Expectation of e raised to a normalMediumRandom VariablesExpected Value Premium
- Expected flips for HTMediumExpected ValueStochastic Processes Premium
- Fair outcome from a biased coinMediumProbabilityStatistics Premium
- Fast FibonacciMediumProgramming & DSA Premium
- Fibonacci with memoizationMediumProgramming & DSA Premium
- First passage to ±1MediumStochastic Processes Premium
- Forward price with carryMediumFinance & Derivatives Premium
- Forward price with dividendMediumFinance & Derivatives Premium
- Fox, goose, beans crossingMediumBrainteasers Premium
- Gambler's ruin (unfair)MediumProbabilityStochastic Processes Premium
- HT before HH in coin flipsMediumProbabilityStochastic Processes Premium
- Integral by substitution: 2x e^(x^2)MediumCalculus Premium
- Integral of ln xMediumCalculus Premium
- Inversions in a shuffleMediumCombinatoricsExpected Value Premium
- Is W(t)³ a martingale?MediumStochastic Processes Premium
- Is the random walk squared a martingale?MediumExpected ValueStochastic Processes Premium
- Keeping two apartMediumCombinatorics Premium
- Kelly sizingMediumMarket Making & Betting Games Premium
- Letters into envelopesMediumProbabilityExpected Value Premium
- Limit of x^100 over e^xMediumCalculus Premium
- Markov's boundMediumStatistics Premium
- Memoized recursion vs tabulationMediumProgramming & DSA Premium
- Memoryless waitingMediumConditional Probability & ExpectationRandom Variables Premium
- Monty Hall with 100 doorsMediumProbabilityConditional Probability & Expectation Premium
- Nine coins, one heavyMediumCombinatoricsBrainteasers Premium
- No two heads in a rowMediumProbabilityCombinatorics Premium
- No-arbitrage call boundsMediumFinance & Derivatives Premium
- Non-attacking rooksMediumCombinatorics Premium
- Onto functionsMediumCombinatorics Premium
- Order statistics of two uniformsMediumRandom VariablesStatistics Premium
- Pair at a round tableMediumCombinatorics Premium
- Periodicity and limiting distributionMediumStochastic Processes Premium
- Points on a semicircleMediumProbability Premium
- Power of three in a factorialMediumCombinatorics Premium
- Pricing a digital optionMediumFinance & Derivatives Premium
- Put-call parityMediumFinance & Derivatives Premium
- Put-call parity: solve for the putMediumFinance & Derivatives Premium
- Reading order flowMediumMarket Making & Betting Games Premium
- Regression to the meanMediumBrainteasersStatistics Premium
- Sampling an exponential from a uniformMediumRandom VariablesProgramming & DSA Premium
- Second-price auction strategyMediumProbabilityMarket Making & Betting Games Premium
- Simulate probability pMediumProbabilityProgramming & DSA Premium
- Spaced onesMediumCombinatorics Premium
- Splitting a known sumMediumConditional Probability & ExpectationExpected Value Premium
- Standard error of a proportionMediumRandom VariablesStatistics Premium
- The Gaussian integralMediumCalculus Premium
- The larger die shows a 4MediumProbabilityRandom Variables Premium
- The missing dollarMediumBrainteasers Premium
- The probability integral transformMediumRandom VariablesStatistics Premium
- The two-headed coinMediumProbabilityConditional Probability & Expectation Premium
- Three prisonersMediumProbabilityConditional Probability & Expectation Premium
- Three rolls, keep the lastMediumExpected Value Premium
- Tiling a stripMediumCombinatorics Premium
- Trace of a productMediumLinear Algebra Premium
- Two trains and a flyMediumBrainteasers Premium
- Uniform random permutationMediumProgramming & DSA Premium
- Variance from a uniform dieMediumRandom VariablesExpected Value Premium
- Which coin produced two heads?MediumProbabilityConditional Probability & Expectation Premium
- Width of a market under uncertaintyMediumMarket Making & Betting GamesStatistics Premium
- Within distance d on the unit intervalMediumProbabilityCalculus Premium
- k-th order statisticMediumExpected ValueStatistics Premium
- A 12 before two 7sHardProbabilityStochastic Processes Premium
- A divergent reciprocal expectationHardRandom VariablesCalculus Premium
- A void suit in bridgeHardProbabilityCombinatorics Premium
- Adverse selection in quotingHardMarket Making & Betting Games Premium
- Ages from product and sumHardCombinatoricsBrainteasers Premium
- Amoeba extinctionHardProbabilityStochastic Processes Premium
- Balanced parenthesesHardCombinatoricsProgramming & DSA Premium
- Bertrand's chordHardProbabilityBrainteasers Premium
- Best-of-seven underdogHardProbabilityRandom Variables Premium
- Blue-eyed islandersHardBrainteasers Premium
- Bluffing frequency in pokerHardProbabilityExpected Value Premium
- Branching process extinction (critical)HardProbabilityStochastic Processes Premium
- Broken-stick triangleHardProbability Premium
- Buffon's needleHardProbabilityCalculus Premium
- Cayley–Hamilton theoremHardLinear Algebra Premium
- Connecting noodlesHardProbabilityExpected Value Premium
- Correlation of min and maxHardProbabilityRandom Variables Premium
- Covariance of multinomial countsHardRandom VariablesStatistics Premium
- Cycles in a shuffleHardCombinatoricsExpected Value Premium
- Defective stack of coinsHardCombinatoricsBrainteasers Premium
- Draws until a smaller valueHardExpected Value Premium
- Drunk man on a bridgeHardExpected ValueStochastic Processes Premium
- Ehrenfest urn stationary distributionHardProbabilityStochastic Processes Premium
- Expected flips for HHHardRandom VariablesExpected Value Premium
- Expected flips for HHHHardExpected ValueStochastic Processes Premium
- Expected flips for HTHHardExpected ValueStochastic Processes Premium
- First-price auction shadingHardProbabilityExpected Value Premium
- Four heads in a rowHardExpected ValueStochastic Processes Premium
- Gamma and rehedging P&LHardFinance & Derivatives Premium
- Handshakes at a dinner partyHardCombinatoricsBrainteasers Premium
- Hats in a lineHardBrainteasers Premium
- Hats with 100 colorsHardBrainteasers Premium
- Inventory skewHardMarket Making & Betting Games Premium
- Itô drift of W squaredHardCalculusStochastic Processes Premium
- Laplace's rule of successionHardProbabilityConditional Probability & Expectation Premium
- Law of total varianceHardConditional Probability & ExpectationExpected Value Premium
- Leibniz rule derivative at x = 1HardCalculus Premium
- Making change in lineHardCombinatoricsStochastic Processes Premium
- Max rectangle under a parabolaHardCalculus Premium
- Maximize x + y on the unit circleHardLinear AlgebraCalculus Premium
- Meaning of N(d₂)HardFinance & Derivatives Premium
- Newton's method convergenceHardCalculusProgramming & DSA Premium
- Optimal bid-ask placementHardMarket Making & Betting Games Premium
- Optional stopping between +3 and −5HardExpected ValueStochastic Processes Premium
- Pirate gameHardMarket Making & Betting Games Premium
- Position of the first aceHardConditional Probability & ExpectationExpected Value Premium
- Prisoners and the boxesHardProbabilityBrainteasers Premium
- Prisoners and the light switchHardBrainteasers Premium
- Ratio of two normalsHardRandom VariablesStatistics Premium
- Reservoir samplingHardStatisticsProgramming & DSA Premium
- Risk-neutral up probabilityHardStochastic ProcessesFinance & Derivatives Premium
- Sum of the alternating harmonic seriesHardCalculus Premium
- The all-pay auctionHardProbabilityExpected Value Premium
- The boy born on a TuesdayHardProbabilityConditional Probability & Expectation Premium
- The drunk passengerHardProbabilityConditional Probability & Expectation Premium
- The racing camelsHardBrainteasers Premium
- The snow plowHardCalculus Premium
- The two-envelopes paradoxHardProbabilityConditional Probability & Expectation Premium
- Three unlabeled teamsHardCombinatorics Premium
- Triangle that swallows the centerHardProbabilityBrainteasers Premium
- Twelve balls, one oddHardBrainteasers Premium
- Two eggs, 100 floorsHardBrainteasers Premium
- Two-color necklacesHardCombinatorics Premium
- Uniforms summing past 1HardRandom VariablesExpected Value Premium
- Value of iⁱHardCalculus Premium
- Value of the Basel sumHardCalculus Premium
- World Series bettingHardExpected ValueStochastic Processes Premium
Practise Jane Street questions free
Create a free account to check your answers, track progress, and work timed simulators. Premium unlocks a full worked solution for every question.
Start practising free