Investment Banking & Asset Management interview questions

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Trader at Jane Street

Sep 4, 2011

“Suppose you have n points on a circle distributed such that after connecting all of the points with chords, the number of regions in the circle is maximized. How many regions are there?”

“You flip four coins. At least two are tails. What is the probability that exactly three are tails? Do this in your head, you are not allowed to write anything down for this question.”

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“You are in a room with 3 switches which correspond to 3 bulbs in another room and you don't know which switch corresponds to which bulb. You can only enter the room with the bulbs once. You can NOT…”

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“you have five coins. One is double-headed. Pick one coin at random without looking and throw it 5 times. Suppose the outcome are five heads, what is the probability that the coin picked is the…”

“If you have 2 coins in your pocket (one is double-headed, and the other is a fair coin), you grab a random coin from your pocket and see that one face is a head. What is the probability that if you…”

“If you roll a fair coin 12 times what is the expected product of number of heads and number of tails? (No papers of course)”

“You roll a die until the sum of the integers rolled is greater than 13. What number are you most likely to stop on?”

“how many combinations that have at least one five from zero to 1000”

“You are to write a method getMissingLetters, which takes a String, sentence, and returns all the letters it is missing (which prevent it from being a pangram)”

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