Intern Interview Questions

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you and a friend are playing a coin tossing game. You will be tossing a coin and tracking the results. You each have a sequence you're looking for. Your sequence is HTT, your friends sequence is HHT. the player whos sequence appears first in the game wins. Would you want to play? What is your probability of winning?
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Quantitative Trader Intern

Interviewed at Jane Street

4.4
Aug 6, 2020

you and a friend are playing a coin tossing game. You will be tossing a coin and tracking the results. You each have a sequence you're looking for. Your sequence is HTT, your friends sequence is HHT. the player whos sequence appears first in the game wins. Would you want to play? What is your probability of winning?

The first three questions are mental math. I still remember the hardest one is calculating the 39% of 569 without any pen or paper. The next question is a simple probability: pick 2 cards from a set of poker without 2 Jokers, what is the probability that both cards are Ks. The last one is brain teaser: what is the angle between the minute hand and hour hand on a clock when 9:30.
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Trader Intern

Interviewed at Jane Street

4.4
Apr 12, 2014

The first three questions are mental math. I still remember the hardest one is calculating the 39% of 569 without any pen or paper. The next question is a simple probability: pick 2 cards from a set of poker without 2 Jokers, what is the probability that both cards are Ks. The last one is brain teaser: what is the angle between the minute hand and hour hand on a clock when 9:30.

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