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The Product Rule
Question: 2013 Fall Midterm - 1
1 . Let $A$ be a set of size 5 and let $B$ be a set of size 8. How many one-to-one functions $f: A \rightarrow B$ are there?
(a)
$\frac{8!}{2!}$
(b)
$\frac{3!}{8!}$
(c)
$\frac{7!}{4!}$
(d)
$\frac{8!}{3!}$
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