Learn the methods
Short lessons on the ideas quant interviews test most. Each one explains the method, works through examples, flags the common traps, and ends with practice problems you can try right on the page.
1
Expected value and linearity
ProbabilityIndicators, geometric waits and first-step analysis: the tools behind most "on average" questions.
2Conditional probability and Bayes
ProbabilityWhy a positive test can mean 50%, Monty Hall by counting, and updating in odds.
3Random walks and gambler's ruin
ProbabilityFair games, hitting probabilities and expected hitting times in one idea.
4Options and the Greeks
OptionsPayoffs, put–call parity, one-step pricing, delta, gamma, vega, theta and the 0.4·S·σ·√T trick.
5The Kelly criterion
RiskHow much to bet when you have an edge, and why over-betting ruins you anyway.
6Making markets and estimating
TradingBids, asks, spreads, Fermi estimation and reacting to trades.
Ready to drill? Browse the interview questions by topic or open the full Problem Bank.