- Determine how events there are
- Determine how many outcomes there are for each event
- Multiply the number of options for each of the events together.
The fundamental counting principle is a mathematical rule that allows you to find the number of ways that a combination of events can occur. For example, if the first event can occur 3 ways, the second event can occur 7 ways, and the third event can occur 5 ways, then you can find out the number of unique combinations by multiplying: 3 * 7 * 5 = 105 unique combinations.