Jane StreetQuant ResearcherQuantitative ResearcherQuestion #377
Given 3 black and 2 white balls in a bag, you may take out several balls and stop whenever you choose. How should you determine when to stop in order to maximize the expected value of the number of black balls minus the number of white balls (b - w) you draw?
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 Quant Researcher Questions
In a Rock-Paper-Scissors game where your opponent is not allowed to play rock, you win $1 for each win, lose $1 for each loss, and draw $0 for a tie. What should you play to maximize your expected profit?You are rolling a die. Each time you roll, you can either stop the game and receive payment equal to the face-up value, or choose to roll again. You may roll up to three times in total. What is the expected gain from playing this game optimally?Suppose you are playing Russian roulette. What is the probability that the person who fires first wins?Given the probabilities with which your opponent will play Rock, Paper, and Scissors, how should you respond to maximize your expected winnings?You have 3,000 apples in Edinburgh and want to transfer as many as possible to London. You have a truck with a maximum capacity of 1,000 apples. London is 1,000 miles away from Edinburgh. For every mile the truck drives while carrying apples, it consumes (or drops) one apple. What is the maximum number of apples you can deliver to London?
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