Practice By Tag: 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)

$\frac{8!}{3!}$