Goldman Sachs: Suppose you had eight identical balls. One of them is slightly heavier and you are given a balance scale. What’s the fewest number of times you have to use the scale to find the heavier ball?
Jane Street Capital: What is the smallest number divisible by 225 that consists of all 1’s and 0’s?
UBS: If we were playing Russian roulette and had one bullet, I randomly spun the chamber and fired but nothing was fired. Would you rather fire the gun again or respin the chamber and then fire on your turn?
Merrill Lynch: Tell me about your life from kindergarten onwards.
Susquehanna International Group: Five guys, all of different ages, enter a bar and take a seat at a round table. What is the probability that they are seated in ascending order of age?
“…I have this strange feeling that I’m not myself anymore. It’s hard to put into words, but I guess it’s like I was fast asleep, and someone came, disassembled me, and hurriedly put me back together again. That sort of feeling.”—Haruki Murakami (via modernmethadone)