## Probability of Event A OR Event B

Summary

Understanding the OR rule in probability is crucial for solving GRE problems, especially when dealing with mutually exclusive and non-mutually exclusive events.

- The simple OR rule applies to mutually exclusive events, where the probability of A or B is the sum of their individual probabilities.
- For non-mutually exclusive events, the general OR rule requires subtracting the overlap probability from the sum of the individual probabilities of A and B.
- Visualizing these rules through diagrams can aid in comprehending why addition or subtraction is necessary in calculating probabilities.
- The general OR rule, which accounts for overlap, is universally applicable and a powerful tool in probability calculations.

Chapters

00:01

Introduction to the OR Rule

00:15

The Simple OR Rule for Mutually Exclusive Events

01:20

The General OR Rule for Non-Mutually Exclusive Events

00:46

Visualizing Probability with Diagrams