The Monty Hall Problem
Why switching doors is always the right choice
You're on a game show.
Three doors. Behind one: a car. Behind the others: goats. You pick a door. The host — who knows exactly what's behind each one — opens a different door to reveal a goat. Now he offers you a choice: stick with your door, or switch to the other one.
Most people stay put. Most people are wrong.
Challenging