Answer
24
Work Step by Step
The number of possible permutations if r items are taken from n items is
nPr =$\frac{n!}{(n-r)!}$
The number of ways that the four remaining jokes can be ranked is:
= 4P4
=$\frac{4!}{(4-4)!}$
=$\frac{4!}{0!}$
=24 ways