Trader Assistant Interview Questions

578 trader assistant interview questions shared by candidates

I have a jar filled with 100 pennies. 1 of those pennies has two heads, the others are normal pennies. I randomly choose one penny, flip it seven times, and get seven heads. Am I holding the two-headed penny or a normal penny?
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Assistant Trader

Interviewed at DRW

4.3
Jan 26, 2010

I have a jar filled with 100 pennies. 1 of those pennies has two heads, the others are normal pennies. I randomly choose one penny, flip it seven times, and get seven heads. Am I holding the two-headed penny or a normal penny?

You have 17 coins and I have 16 coins, we flip all coins at the same time. If you have more heads then you win, if we have the same number of heads or if you have less then I win. What's your probability of winning?
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Assistant Trader

Interviewed at Susquehanna International Group

3.8
Mar 28, 2016

You have 17 coins and I have 16 coins, we flip all coins at the same time. If you have more heads then you win, if we have the same number of heads or if you have less then I win. What's your probability of winning?

One about flipping coins. Can't remember the exact question but it was something like coin A has 0.6 probability of being heads, Coin B has a 0.3 probability of being heads and Coin C has a 0.1 probability of heads. Given that a coin is flipped and lands on heads, what is the probability that when it is flipped again it will also be heads.
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Assistant Trader

Interviewed at Jane Street

4.4
Jul 15, 2015

One about flipping coins. Can't remember the exact question but it was something like coin A has 0.6 probability of being heads, Coin B has a 0.3 probability of being heads and Coin C has a 0.1 probability of heads. Given that a coin is flipped and lands on heads, what is the probability that when it is flipped again it will also be heads.

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