Jane Street–styleTraderTraderQuestion #324

You are given a deck of cards numbered 1 to 100 and two boxes. For each card, flip a fair coin: place the card in the left box if heads, right box if tails. Find the expected value of the minimum card in the box that contains card 100.

Build Your Approach

State the assumptions, try a simple case, then work toward a general solution. Check the result and explain how it changes if an assumption changes.

Try the free diagnostic with worked solutions →

Get Free Interview Prep Resources

Practice the Reasoning Behind the Answer

Bring your target roles and interview timeline to a free quant consult. Discuss your preparation priorities and how Quant Blueprint’s lessons, practice and mock interviews can help.

Book a Free Quant Consult

Your goals · your preparation · your next steps