Quant Developer Interview Questions

2,953 quant developer interview questions shared by candidates

Problem from first interview: you repeatedly roll a fair 6 sided dice. every roll you add the result to your score. At any time you may end the game and keep your score, however if your total score ever becomes a perfect square you lose with 0 points. How should you play?
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Quant Trader Intern

Interviewed at Jane Street

4.4
Jan 19, 2024

Problem from first interview: you repeatedly roll a fair 6 sided dice. every roll you add the result to your score. At any time you may end the game and keep your score, however if your total score ever becomes a perfect square you lose with 0 points. How should you play?

You are playing a one-player game with two opaque boxes. At each turn, you can choose to either "place" or "take". "Place" places $ $1 from a third party into one box randomly. "Take" empties out one box randomly and that money is yours. This game consists of 100 turns where you must either place or take. Assuming optimal play, what is the expected payoff of this game? Note that you do not know how much money you have taken until the end of the game.
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Quant Internship

Interviewed at Jane Street

4.4
Nov 13, 2024

You are playing a one-player game with two opaque boxes. At each turn, you can choose to either "place" or "take". "Place" places $ $1 from a third party into one box randomly. "Take" empties out one box randomly and that money is yours. This game consists of 100 turns where you must either place or take. Assuming optimal play, what is the expected payoff of this game? Note that you do not know how much money you have taken until the end of the game.

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