So, let's sum up the counting principle:
If you have a list of events (or choices) that occur in order (one after another) and there are
then the number of ways they can all be done is * and you can keep going... as many events as you have! |
* The key is that you do event 1, then event 2,
then event 3, and so on.
Here's another example:
You're buying a new car. You have 3 choices for the model: The
Additron, The Subtracto and The Quotient. You have 5 choices for
color: red, blue, black, white and pina colada cream. You have 2
choices for transmission: stick and automatic. How many choices
do you have?
TRY IT:
You're picking an outfit for school. In your closet you find 4 pairs of pants, 8 shirts and 6 belts. Assuming everything matches, how many outfits can you create?