Quant
A step-by-step course in the probability and expected value asked in quant interviews.
0/28
Mastered
- Easy
- 0/9
- Medium
- 0/14
- Hard
- 0/5
StatusLessonUnitLevel
1. Multiplying choicesCount outcomes of choices made in steps · 5 question typesEasy · Counting · 5 typesCountingEasy2. PermutationsCount arrangements when order matters · 8 question typesEasy · Counting · 8 typesCountingEasy3. CombinationsCount groups when order doesn’t matter · 7 question typesMedium · Counting · 7 typesCountingMedium4. Inclusion–exclusionCount things that fall in either group · 7 question typesMedium · Counting · 7 typesCountingMedium5. Equally likely outcomesFind a chance by counting outcomes · 10 question typesEasy · Probability basics · 10 typesProbability basicsEasy6. ComplementsUse 1 minus the chance it doesn’t happen · 5 question typesEasy · Probability basics · 5 typesProbability basicsEasy7. “Or” eventsAdd chances without double counting · 4 question typesMedium · Probability basics · 4 typesProbability basicsMedium8. “And” eventsMultiply chances when all must happen · 5 question typesMedium · Probability basics · 5 typesProbability basicsMedium9. Conditional probabilityFind a chance given something happened · 5 question typesMedium · Conditional probability · 5 typesConditional probabilityMedium10. Splitting into casesFind a chance by adding up every case · 7 question typesMedium · Conditional probability · 7 typesConditional probabilityMedium11. Bayes’ ruleWork back from evidence to its cause · 5 question typesHard · Conditional probability · 5 typesConditional probabilityHard12. Expected valueWork out what a bet is worth · 8 question typesEasy · Expected value · 8 typesExpected valueEasy13. Linearity of expectationFind an average by adding simple parts · 10 question typesMedium · Expected value · 10 typesExpected valueMedium14. Variance and standard deviationMeasure how spread out results are · 7 question typesMedium · Expected value · 7 typesExpected valueMedium15. Binomial distributionFind the chance of k wins in n tries · 5 question typesMedium · Distributions · 5 typesDistributionsMedium16. Geometric distributionFind how long until the first success · 9 question typesMedium · Distributions · 9 typesDistributionsMedium17. Normal distributionUse the 68–95–99.7 rule · 6 question typesEasy · Distributions · 6 typesDistributionsEasy18. Odds and implied probabilityTurn odds and prices into chances · 5 question typesEasy · Betting · 5 typesBettingEasy19. Expected value of a betDecide whether a bet makes money · 4 question typesMedium · Betting · 4 typesBettingMedium20. House edgeFind what a casino bet costs per $1 · 5 question typesEasy · Betting · 5 typesBettingEasy21. Kelly criterionFind how much of your bankroll to bet · 4 question typesMedium · Betting · 4 typesBettingMedium22. Collecting every typeFind how long until you’ve seen them all · 4 question typesMedium · Thinking in states · 4 typesThinking in statesMedium23. Patterns in a rowFind the wait for a run like HTH · 5 question typesHard · Thinking in states · 5 typesThinking in statesHard24. Random walksFind the chance and time to hit a target · 7 question typesHard · Thinking in states · 7 typesThinking in statesHard25. Optimal stoppingDecide when to stop and when to go on · 5 question typesHard · Thinking in states · 5 typesThinking in statesHard26. Uniform random numbersWork with a random number in a range · 5 question typesEasy · Continuous probability · 5 typesContinuous probabilityEasy27. Probability as areaSolve two-number questions with a square · 7 question typesMedium · Continuous probability · 7 typesContinuous probabilityMedium28. Highest and lowest valuesFind the average max or min of a sample · 4 question typesHard · Continuous probability · 4 typesContinuous probabilityHard