Jane StreetInternInternQuestion #516
You have a shuffled deck of 26 red and 26 black cards. You play a game by repeatedly looking at the top card and either discarding it or ending the game. At the end, if the color of the next card matches the top card, you win; otherwise, you lose. What is the optimal strategy?
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.
More Jane Street Intern Questions
Design a real-time system to process millions of trades per second. How would you ensure low latency, fault tolerance, and exactly-once processing?If I roll two dice, what is the expected value of the product of the two faces?Suppose we play a game with a die where we roll and sum our rolls. We can stop at any time, and the sum is our score. However, if our sum is ever a multiple of 10, our score becomes zero and our game is over. What strategy will yield the greatest expected score? What about if the target multiple is a value other than 10?Implement the game Tetris in 30 minutes.What is the optimal strategy for winning in rock-paper-scissors if your opponent can only choose between rock and paper?
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