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1 . Consider a set $A$ having size 7 and a set $B$ having size 9. How many one-to-one functions $f : A \rightarrow B$ are there?

(a)

$\frac{9!}{3}$

(b)

$\frac{7!}{2}$

(c)

$\frac{9!}{2}$

(d)

$\frac{7!}{3}$