Mathematical problems are easy and mainly are about probability, statistics and linear algebra. Only the last question is somewhat hard. The first code test is about string manipulation. It's easy. I practice Python in Leetcode and this question is no more than middle level in Leetcode. The second is difficult and took me some time to understand it.
Probability question from the green covered book...
Statistical coin question
Expected number of loops in a bowl of N noodles
write a code for a black jack simulator. some questions about object oriented programming and Montecarlo simulation.
Implied volatility stuff, correlation, covariance, linear algebra
Distribution of the maximum of two correlated Gaussians.
Describe your previous experience with survey methods
the minimum set of numbers that can combined 40 with minus and plus
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