Jane StreetQuant ResearcherQuantitative ResearcherQuestion #388

There are 100 coins, each flipped and the results are hidden. You can ask one yes/no question, after which you must guess the outcome of each coin flip. For each correct guess, you earn 1 dollar; for each incorrect guess, you lose 1 dollar. What is the optimal strategy for maximizing your expected return, and what is the maximum expected value?

Unlock the Full Solution

Enter your email to get the detailed step-by-step solution to this Jane Street interview question, plus access to free interview prep resources.

We'll also send you a free HFT mock interview video.

Get All 664+ Jane Street Questions with Solutions

Plus 16+ hours of video lectures, resume tailoring, and 1:1 mentorship from quants.

Schedule a Call