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Here's the official formula:
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The
number of ways to CHOOSE
n
objects
taken
r
at a time is
* This
can also be phrased as "how many combinations?" |
Here are some other notations:
|
 |
"C"
is for "choose"
(it's really "combinations") |
This is
NOT
a fraction! |
Let's try it!
You have
105
employees and you need to select a committee of
3.
How many ways can you do it?
* Ask yourself: Does order
matter?
NO! So, use
the choosing formula.
Continued on the
next
page
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The printing
and distribution and/or downloading of these lessons is strictly
prohibited. |
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