Combined Events & Tree Diagrams

Find the probability of two or more events happening by listing outcomes or drawing a tree diagram.

The AND and OR Rules

Use the multiplication rule for independent events (AND) and the addition rule for mutually exclusive events (OR) to solve combined probability problems.
Sample Space Diagrams

List all possible outcomes of two events in a table and use it to find the probability of combined events quickly.
Tree Diagrams

Draw and use tree diagrams to find probabilities of two or more events in sequence, using the multiply-along and add-across rules.