# Trader Intern Interview Questions

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### Trader Intern at Jane Street

Jan 12, 2011
 “Russian Roulette - 4 blanks 2 bullets, all in a row. If someone shoots a blank next to you, would you take another shot or spin”

### Trader Intern at Jane Street

Sep 20, 2011
 “What if you could reflip 1 coin that you wanted. What would be the expected value then?”

### Trader Intern at Jane Street

Oct 12, 2010
 “What is the smallest number divisible by 225 that consists of all 1s and 0s?”

### Trader Assistant Intern at DRW Trading

Mar 2, 2010
 “What is the chance that at least two people were born on the same day of the week if there are 3 people in the room?”

### Trader Intern at Jane Street

Jan 29, 2012
 “You are playing a game in which four fair coins are flipped and the amount of money you receive in dollars is equal to the number of heads that appear in total. If you do not like the outcome of the…”

### Trader Intern at Jane Street

Sep 20, 2011
 “You have 4 coins. You throw them in the air. For every H that lends, you get 1 dollar. How much would you pay to play this game?”

### Ssistant Trader Intern Position at Susquehanna International Group, LLP

Dec 12, 2011
 “question about having 12 marble (1 weigh different) , and one balance. Ask to find the different weight one with least try.”

### Trader Intern at Jane Street

Sep 20, 2011
 “Now, you have an option to reflip all the coins if you want. What's your strategy? And how what's the expected value?”

### Intern Trader at J H Darbie &Co

Aug 1, 2012
 “Sell me an invisible Pen”

### Assistant Trader Intern at Susquehanna International Group, LLP

Feb 18, 2011
 “Five guys, all of different ages enter a bar and take a seat at a round table. What is the probability that they are seated in ascending order of age? (clockwise or counter-clockwise)”
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