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231 Interviews



Jane street capital Interview Questions

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Quant at Jane Street

Nov 22, 2010

“suppose you have a perfectly round disk. You put three legs randomly on this disk to form a table. Supposing the legs are perfectly perpendicular to the disk and are attached to the disk firmly, what…”

“During the third interview : imagine an infinite chess board. If the horse from 1 case, in how many cases can he possibly ends after 10 moves. You actually don't have to give a number but a…”

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.”

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

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.”

“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…”

“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…”

“Simulate a 6 sided die with a coin.”

“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”

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