How do you find probabilities of compound events?
Depends on the relation between the events.
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.
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: