The most difficult question is a "homework" which is given before the interview. No right answer, just to see how you deal with a problem with little information.
Quantitative Research Interview Questions
3,504 quantitative research interview questions shared by candidates
Josephus Problem... You could find it on Wikipedia
Basic linear algebra and probabilities questions.
lots of coin problems fair,unfair
40 questions including probability, calculus, linear algebra, programming
They love coin problems(both unbiased, biased). Some concept of C++ language(What is virtual function).
array, loop, binary search questions
There was a classic throwing glass ball question. You have two glass balls, and there is 100-floor building. Design a method to testify which floor is the boundary to savely throw the ball.
questions on math and programming
They asked a very open ended question based on my resume.
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