# Quant 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…”

### Quant Research Intern at Susquehanna International Group, LLP

Mar 17, 2013
 “Suppose you have two covariance matrices A and B. Is AB also a covariance matrix? Suppose that, by plain dumb luck, we also have that AB=BA. Is AB a covariance matrix under this additional…”

### Quant Internship at Jane Street

May 6, 2011
 “You have 100 marbles, 50 are blue, 50 are red. You want to distribute them between two drawers, in such a way that none is left outside and no drawer is left empty.After distributing them you are…”
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### Quant at Jane Street

Nov 22, 2010
 “suppose you live in middle town, your mom lives in downtown while your girl friend lives in uptown. You take subway to have dinner with either your mom or your girl friend every night. You always the…”

### Quant at Jane Street

Apr 1, 2012
 “Unfair coin with P(H) = 1/3 and P(T) = 2/3.a) How to make an event with 50% probability?b) Expected number of flips until a realization occurs?c) Can you create a strategy to reduce the number…”

### Quant Research Intern at Susquehanna International Group, LLP

Mar 17, 2013
 “Suppose you have 100 GB of data that you want to sort, but you only have 1 GB of memory. How would you sort this data?”

### Quant at Jane Street

Dec 21, 2010
 “find a subset of {1,2,3,...,30} so that numbers in that subset is coprime to each other.”

### Quant at Jane Street

Nov 22, 2010
 “estimate how many gallons of gas are consumed in US per week”

### Quant at Renaissance Technologies LLC

Jan 10, 2012
 “how fast can you find the max in a sorted list of numbers”

### Quant at Jane Street

Nov 22, 2010
 “suppose you, player A, player B are in a tennis tournament. Player A has a better chance of beating you than player B does. If you would like to maximize your chance of winning two games in a row…”
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