Expected Tosses Until HHT Given HHT Appears Before HTH
Company: DRW
Role: Quantitative Researcher
Category: Statistics & Math
Difficulty: hard
Interview Round: Onsite
Overview: Coin-pattern race question in which a fair coin is tossed until HTH or HHT appears. Asks for the expected number of tosses given that HHT appears first, testing Markov chain modeling of pattern matching, win probabilities, and the correct computation of conditional expectations.
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