# How do you find probabilities of compound events?

##### 1 Answer

Nov 18, 2017

Depends on the relation between the events.

#### Explanation:

**Example1:** probability of rolling a 3 or a 5 with one throw.

Since this is an exclusive OR situation we ADD the probabilities:

**Example2:** probability of first rolling a 3, and then a 5 with one die.

1st roll:

Since this is an AND situation, we MULTIPLY:

Note: if the question were about 'a 3 and a 5' (in any order) we'd have to add: