# Fan Appreciation Night, Part 2

### Resources for this lesson:

**Key Terms**

Union

> Glossary

> Calculator Resources

> Teacher Resources: Instructional Notes

Think of each event as a circle or group. For mutually exclusive events, the events would be represented with non-overlapping circles.

To calculate probabilities of mutually exclusive events, the probability of either event occurring is simply the sum of the probabilities of each individual event. So, . The is known as finding the probability of the union of A and B, and may also be written as .

For the first drawing, the probability of Allyson or Andrew winning would be .

## Test and Confirm

## Check Your Understanding