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Probability for Quant Interviews

The probability toolkit interviewers test most: conditioning, Bayes, counting, expectation and the classic puzzles — with an emphasis on fast, structured reasoning.

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2 of 5 lessons available. The rest are in development.

Module 1

Conditioning and Counting

1.Conditional Probability & Bayes' TheoremUpdate beliefs correctly, avoid base-rate neglect, and recognise how the way information arrives changes the answer.20m 2.Counting & CombinatoricsPermutations, combinations, stars and bars, inclusion–exclusion and symmetry arguments.In development25m

Module 2

Expectation

3.Expected Value & LinearityLinearity of expectation, indicator variables and first-step analysis — the three tools behind most expected-value questions.25m 4.Conditional ExpectationThe tower property, conditioning on the first step, and Wald's identity.In development25m 5.Classic Interview PuzzlesA guided tour of the puzzles that come up again and again, and the patterns behind them.In development30m