Hudson River Trading

Interview Question

Algorithm Developer Interview
Hudson River Trading

If I have a jar with 1,000 coins and one of them is double-headed, I pick one coin at random and flip 10 heads in a row. What is the probability that I picked the double-headed coin?

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!