Jane Street

Interview Question

Quantitative Trader Intern Interview
Jane Street

You and a friend are playing a coin tossing game. You toss a fair coin repeatedly and track the results. Each of you has a sequence you are watching for: your sequence is HTT and your friend's sequence is HHT. The player whose sequence appears first wins the game. Would you want to play? What is your probability of winning?

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!