A small city has three automobile dealerships:
- a GM dealer selling Chevrolets and Buicks
- a Ford dealer selling Fords and Lincolns
- a Toyota dealer.
If an experiment consists of observing the brand of the next car sold, then the events
- A = { Chevrolet, Buick }
- B = { Ford, Lincoln } are mutually exclusive because the next car sold cannot be both a GM product and a Ford product (at least until the two companies merge!).