Exercise 5.4-2 from Chapter 5 Probabilistic Analysis and Randomized Algorithms (Introduction to Algorithms, CLRS)
"Suppose that we toss balls into b bins until some bin contains two balls. Each toss is independent, and each ball is equally likely to end up in any bin. What is the expected number of ball tosses?"
A solution: https://sites.math.rutgers.edu/~ajl213/CLRS/Ch5.pdf
