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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
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ways to do event
1 |
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ways to do event
2 |
 |
ways to do event
3 |
then
the number of ways they can all be done is
* and you can
keep going... as many events as you have!
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* 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?
Continued on the
next
page
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