I interviewed at WorldQuant (Ramat Gan) in Oct 2018
Interview
A test that takes approximately 3 hours and consists of mathematical brain teasers, some statistics, probability & combinatorics, complexity & multi-dimensional integrals.
I had to answer each question in aprox. 3-4 minutes.
Interview questions [8]
Question 1
Two ferries at the same time on opposite sides of a river move orthogonal to river at constant but different speeds. First meet at 400m from left, second time after the turn and 300m from the right side. How wide is the river?
Bob walked for 5 hours. First he followed a horizontal road, then walked up the mountain and finally returned to the starting point using same route. Bob’s speed on horizontal road was 4 km/h, up the mountain 3 km/h, and down the mountain 6 km/h. How many kilometers did Bob walk?
Triangle ABC has sides of length 45, 60, and 75. Place a point D randomly and uniformly inside the triangle. What is the expected value of the sum of perpendicular distances from point D to the triangle's three sides?
Assume there are three random variables X,Y,Z. All pairwise correlations are equal: corr(X,Y) = corr(X,Z) = corr(Y,Z) = r. What is the range of possible values of r?
You have three fair coins. You repetitively flip all coins together. After each round you remove the coins that show tails. What is the expected number of rounds until you have no coins left to flip?
Two tubes (infinite right circular cylinders) A and B of equal radii 3 cross at the angle 90 degrees (i.e. their axial lines cross at that angle). What is the volume of the intersection of A and B?
I applied in-person. I interviewed at WorldQuant (Saint Petersburg, Sankt-Peterburg) in Apr 2019
Interview
3 hours test with probability, programming and statistical parts. Feels pretty solid like an university exam. So you should be prepared well. Some questions have an input form in half approx.
Interview questions [1]
Question 1
There were some questions 1 or 2 with ambiguous condition
Firstly, you should mail your cv to HR, after that you take an invitation to the computer test, this test includes some basic questions in combinatorics, number theory, algorithms, programming, logic, statistics and probability theory
Interview questions [1]
Question 1
You throw a fair coin one million times. What is the expected number of strings of 6 head followed 6 tail
