Easy Quant Researcher Interview Questions
Everything asked of quant researchers, filtered to the easy end - useful for calibrating where you actually are.
157 questions, 154 of them free to practise right now. The topics that come up most are probability (58), combinatorics (34), brainteasers (29), random variables (28).
- A coin that branches into a dieEasyCombinatoricsExpected ValueView →
- A die with one face decrementedEasyProbabilityConditional Probability & ExpectationView →
- A divisor of a power of tenEasyProbabilityCombinatoricsView →
- A factorial ratio that's a factorialEasyBrainteasersView →
- A guest list with a feudEasyCombinatoricsView →
- A limit that hides a difference of logsEasyCalculusView →
- A mile with no windEasyBrainteasersView →
- A mixed second partial derivativeEasyCalculusView →
- A multiple of 15 in ones and zerosEasyBrainteasersView →
- A race between two small-angle ratesEasyCalculusView →
- A ratio of Fibonacci sumsEasyBrainteasersView →
- A root of a product plus oneEasyBrainteasersView →
- A specific sequence given three headsEasyProbabilityConditional Probability & ExpectationView →
- A sum of four before a sum of twoEasyProbabilityView →
- A sum of three cubesEasyBrainteasersView →
- A two-sigma tail probabilityEasyRandom VariablesStatisticsView →
- Age in a square yearEasyBrainteasersView →
- All four aces before any kingEasyProbabilityCombinatoricsView →
- All the squares on a chessboardEasyCombinatoricsBrainteasersView →
- American early exerciseEasyFinance & DerivativesView →
- An alternating sum of squaresEasyBrainteasersView →
- An infinite nested radicalEasyBrainteasersView →
- An odd subset with two small elementsEasyCombinatoricsView →
- Angle under an orthogonal mapEasyLinear AlgebraView →
- Arranging colored balls in a lineEasyCombinatoricsView →
- At least one blue and one greenEasyProbabilityCombinatoricsView →
- Average distance on an intervalEasyRandom VariablesView →
- Backing out the correlation from portfolio riskEasyRandom VariablesStatisticsView →
- Beating a product of uniformsEasyProbabilityRandom VariablesView →
- Beating three othersEasyProbabilityRandom VariablesView →
- Break-even move after a round tripEasyFinance & DerivativesView →
- Chebyshev on a concrete intervalEasyStatisticsView →
- Chi-square test for a varianceEasyStatisticsView →
- Clock angle at 3:15EasyBrainteasersView →
- Coin rolling around a coinEasyBrainteasersView →
- Color switches in a drawEasyRandom VariablesExpected ValueView →
- Correlation from a summed varianceEasyRandom VariablesStatisticsView →
- Correlation of two event indicatorsEasyProbabilityStatisticsView →
- Correlation under rescalingEasyRandom VariablesStatisticsView →
- Counting 8-bit stringsEasyCombinatoricsView →
- Counting complement pairsEasyProgramming & DSAView →
- Counting flushesEasyProbabilityCombinatoricsView →
- Counting nines to 1000EasyCombinatoricsBrainteasersView →
- Counting up-down walks to a targetEasyCombinatoricsView →
- Covariance of a chi-square and a ratioEasyRandom VariablesStatisticsView →
- Covariance of summed Brownian motionsEasyStochastic ProcessesView →
- Crossing the origin twiceEasyStochastic ProcessesView →
- Determinant after antisymmetrizingEasyProbabilityLinear AlgebraView →
- Determinant from trace and one eigenvalueEasyLinear AlgebraView →
- Determinant of a scaled productEasyLinear AlgebraView →
- Diagonal parameter from a triangular determinantEasyLinear AlgebraView →
- Dots on distinct edgesEasyProbabilityCombinatoricsView →
- Eigenvalues of a 2×2 matrixEasyLinear AlgebraView →
- Even count until the coin repeatsEasyProbabilityView →
- Even heads with one fair coinEasyProbabilityConditional Probability & ExpectationView →
- Even numbers, distinct digitsEasyCombinatoricsView →
- Even-size, non-empty subsetEasyProbabilityCombinatoricsView →
- Exactly one clears two-thirdsEasyProbabilityRandom VariablesView →
- Expected distance of a dart from centerEasyProbabilityRandom VariablesView →
- Expected flips after a losing startEasyProbabilityExpected ValueView →
- Expected flips for three headsEasyProbabilityExpected ValueView →
- Expected flips for two heads in a rowEasyProbabilityExpected ValueView →
- Finding the number of blue socksEasyProbabilityCombinatoricsView →
- First tail within two flipsEasyProbabilityView →
- Four dice summing to twentyEasyProbabilityCombinatoricsView →
- Handshakes at four couplesEasyCombinatoricsBrainteasersView →
- How many sixes on the die?EasyExpected ValueBrainteasersView →
- Integers that contain a zeroEasyCombinatoricsBrainteasersView →
- Interior crossings of a decagon's diagonalsEasyCombinatoricsView →
- Interquartile range of an exponentialEasyRandom VariablesStatisticsView →
- Keep it or draw againEasyProbabilityExpected ValueView →
- Keep the d8 or gamble on the d12?EasyProbabilityExpected ValueView →
- Landing two above the startEasyStochastic ProcessesView →
- Lapping on the trackEasyBrainteasersView →
- Largest eigenvalue after squaringEasyLinear AlgebraView →
- Largest possible covarianceEasyRandom VariablesStatisticsView →
- Lattice paths through a checkpointEasyCombinatoricsView →
- MISSISSIPPI with the P's togetherEasyCombinatoricsView →
- Matching a max and a min at zeroEasyProbabilityView →
- Matching a uniform and an exponentialEasyRandom VariablesStatisticsView →
- Matching locks to keysEasyBrainteasersView →
- Maximum of four uniforms in a bandEasyProbabilityRandom VariablesView →
- More heads than tails in six flipsEasyProbabilityView →
- Multiplications saved by Horner's methodEasyProgramming & DSAView →
- No heads in a random number of flipsEasyProbabilityRandom VariablesView →
- Norm after imposing orthogonalityEasyLinear AlgebraView →
- Normalizing a tilted densityEasyRandom VariablesCalculusView →
- One blue die matches the redEasyProbabilityView →
- Origin between two pointsEasyProbabilityView →
- Paid a dollar or the drawEasyExpected ValueStatisticsView →
- Paid the last roll before you stopEasyProbabilityExpected ValueView →
- Parameter values for a singular matrixEasyLinear AlgebraView →
- Polygons with integer anglesEasyBrainteasersView →
- Pooling two independent estimatesEasyRandom VariablesStatisticsView →
- Posterior from a likelihood ratioEasyConditional Probability & ExpectationStatisticsView →
- Profit from a favourable stopping gameEasyExpected ValueStochastic ProcessesView →
- R-squared from the sums of squaresEasyStatisticsView →
- R-squared when you duplicate every pointEasyStatisticsView →
- Reflipping for valueEasyProbabilityExpected ValueView →
- Regressing with zero covarianceEasyRandom VariablesStatisticsView →
- Retries under a hard capEasyExpected ValueStochastic ProcessesView →
- Ripple on a pondEasyCalculusView →
- Rolling a die to size the next dieEasyConditional Probability & ExpectationExpected ValueView →
- Rolling until you match the first rollEasyProbabilityExpected ValueView →
- Rolls until an even sumEasyProbabilityExpected ValueView →
- Round table with a couple togetherEasyCombinatoricsView →
- Same side four timesEasyProbabilityView →
- Sample SD with Bessel's correctionEasyStatisticsView →
- Second moment from varianceEasyRandom VariablesStatisticsView →
- Sharing your weekday of birthEasyProbabilityView →
- Sharpe of two combined uncorrelated strategiesEasyStatisticsFinance & DerivativesView →
- Shrinking the standard errorEasyStatisticsView →
- Six heads from a random biased coinEasyConditional Probability & ExpectationRandom VariablesView →
- Skewness of a Laplace variableEasyRandom VariablesStatisticsView →
- Slope of a product at a special pointEasyCalculusView →
- Solving a linear Diophantine equationEasyBrainteasersView →
- Spread of a two-card sumEasyRandom VariablesStatisticsView →
- Standard deviation of a correlated sumEasyRandom VariablesStatisticsView →
- Sum of cubed eigenvaluesEasyLinear AlgebraView →
- Sum of the OLS coefficientsEasyStatisticsView →
- Tangent-minus-sine third-order limitEasyCalculusView →
- The added babyEasyProbabilityConditional Probability & ExpectationView →
- The higher die shows a fourEasyProbabilityView →
- The largest unmakeable postageEasyBrainteasersView →
- The peak of a decaying pulseEasyCalculusView →
- The price of a triangular gardenEasyBrainteasersView →
- The top two cards form a pairEasyProbabilityCombinatoricsView →
- The weight of the fishEasyBrainteasersView →
- Three cube faces at a cornerEasyProbabilityCombinatoricsView →
- Three distinct dice, no sixEasyProbabilityCombinatoricsView →
- Three primes in six rollsEasyProbabilityView →
- Three raids on the flockEasyBrainteasersView →
- Three-one strings with matching endpointsEasyCombinatoricsView →
- Timing the revolverEasyBrainteasersView →
- Top three dice summing to eighteenEasyProbabilityCombinatoricsView →
- Two mismatched diceEasyProbabilityView →
- Two numbers in different groupsEasyProbabilityCombinatoricsView →
- Two ordering constraints at onceEasyProbabilityCombinatoricsView →
- Two primes with an even sumEasyProbabilityCombinatoricsView →
- Unchanged after ten swingsEasyProbabilityBrainteasersView →
- Units digit of a random productEasyProbabilityCombinatoricsView →
- Upper bound on a dry weekendEasyProbabilityView →
- Variance of a sum of Brownian motionEasyStochastic ProcessesView →
- Variance of an asymmetric random walkEasyRandom VariablesStochastic ProcessesView →
- Ways to reach deuceEasyProbabilityCombinatoricsView →
- Weighting a fixed sumEasyConditional Probability & ExpectationExpected ValueView →
- When the clock hands next meetEasyBrainteasersView →
- When the colony outgrows its life supportEasyBrainteasersCalculusView →
- Where the arrivals landEasyProbabilityStochastic ProcessesView →
- Where the maximum landsEasyRandom VariablesStatisticsView →
- Where x squared log x bottoms outEasyCalculusView →
- Whether either bus comes soonEasyProbabilityRandom VariablesView →
- Which side holds the heavy weightEasyProbabilityCombinatoricsView →
- Winning by a growing marginEasyProbabilityBrainteasersView →
- Three children, all boysEasyProbabilityConditional Probability & Expectation Premium
- Two heads given an even countEasyProbabilityConditional Probability & Expectation Premium
- Two searches, neither hitsEasyRandom Variables Premium
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