1. Math & Statistics Questions Topics include probability, statistics, linear algebra, calculus, and stochastic processes. Examples: "What's the expected number of coin tosses to get two heads in a row?" "Prove that a covariance matrix is always positive semi-definite." 2. Programming & Algorithms Commonly in Python, C++, or Java. May involve writing code to solve problems, optimize algorithms, or simulate processes. Examples: "Implement a Monte Carlo simulation to price an option." "Optimize an algorithm to find arbitrage in FX markets.