Question: 2013 Fall Midterm - 1
Let $A$ be a set of size 7 and let $B$ be a set of size 13. How many one-to-one functions $f: A \rightarrow B$ are there?
(a)
$\frac{13!}{7!}$
(b)
$\frac{13!}{6!}$
(c)
$\frac{13!}{5!}$
(d)
$\frac{6!}{13!}$