Jane Street

Interview Question

Quantitative Trader Interview
Jane Street

A coin has a probability of 0.8 of landing heads. What is the expected number of coin tosses needed to observe two consecutive heads?

Unlock the Full Solution

Enter your email to get instant access to the complete solution, explanation, and similar practice problems.

Insights on 100+ quant firms, understand where to apply, and maximize your chances.

Get the official 2025 QB Quant Firm Tier List

Check your email inbox — you should get the interview in 1-2 minutes!