Trader Quant Interview Questions

741 trader quant interview questions shared by candidates

You are given three envelopes, one of which contains $100 and the others contain nothing. You randomly pick one envelope but don’t open it. The interviewer then opens one of the other two envelopes and shows that it’s empty. Now you have a choice: stick with your original envelope or switch to the other unopened envelope. What should you do to maximize your chances of winning, and why?
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Quant Trader Intern

Interviewed at Jane Street

4.4
Oct 17, 2024

You are given three envelopes, one of which contains $100 and the others contain nothing. You randomly pick one envelope but don’t open it. The interviewer then opens one of the other two envelopes and shows that it’s empty. Now you have a choice: stick with your original envelope or switch to the other unopened envelope. What should you do to maximize your chances of winning, and why?

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