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* For this one, order does NOT
matter! We did this
problem before:
If we
have 8
books, how many ways can we arrange
3
on a
bookshelf?
We figured it out with slots:
But, using the formula gave us the
same thing:
Here's a different question for
you:
If we
have 8
books and we want to take
3
on vacation with us, how
many ways can we do it?
What's the difference between
these problems?
ORDER DOESN'T MATTER!
In the first problem, we were
arranging the 3
books on a shelf... and in the second problem, we're just
tossing the 3
books in a suitcase.
So, if order doesn't matter, we'll
just divide it out!
Arranging the
3
books is 3!
Continued on the
next
page
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