I applied through college or university. I interviewed at Susquehanna International Group (Philadelphia, PA) in Oct 2013
Interview
The first round interview consisted of general question regarding my resume, then two brain teasers.
Interview questions [2]
Question 1
There is a game where you have three coins, and your opponent has three coins. You both flip your coins at the same time. If the number of heads you have matches the number of heads he has, then you win $2. Otherwise you lose $1. Do you want to play this game?
There are 8 marbles, one of which is heavier than the rest. The remaining marbles have equal weights. You also have an old style scale, which is of a balancing type. What is the minimum number of weighings such that you can determine the heavier marble?
Also, describe how you would do so.