Investment Banking & Asset Management interview questions

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Intern at Jane Street

Mar 14, 2011

“If you had only 5 and 11 cent stamps. Whats the smallest number that would be impossible to make with those stamps.”

“Flip a coin until either HHT or HTT appears. Is one more likely to appear first? If so, which one and with what probability?”

Trader at Jane Street

May 2, 2012

“What is the sum of the digits of all the numbers from 1 to 1000000? This is different from the sum of the numbers. For instance the sum of the numbers from 1 to 10 is 55 whereas the sum of the digits…”

“what is the expected number of flips of a coin to simulate a 6 sided die.”

“I got a few C++ questions, then a question on sorting algorithms then a brainteaser. The brainteaser went as follows: Three people are given hats. Each hat is either red or blue, chosen at random…”

“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”

“You have a box filled with cash. Cash value is uniformly randomly distributed from 1 to 1000. You are trying to win the box in an auction: you win the box if you bid at least the value of the cash in…”

“Simulate a 6 sided die with a coin.”

“N points lie on a circle. You draw lines connecting all the points to each other. These lines divide up the circle into a number of regions. How many regions is this? Assume that the points are…”

“You are playing a game where the player gets to draw the number 1-100 out of hat, replace and redraw as many times as they want, with their final number being how many dollars they win from the game…”

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