# It Took Them 606 Takes To Perfect This Ad. Can You Do Better?

**Calculus**Level 3

Each of the interactions we see, from carefully balanced see-saws to swinging mobiles of glass windows, has a certain probability of succeeding each time it is run. If each interaction takes the same amount of time, and we wanted to minimize the total amount of time taken to produce this video, how should the stunts be arranged?