Explanation
In the question, we are told that paul has 5 books to place on a shelf. This is a case of arrangement which requires also using permutation to solve the question.
We will apply the formula below;
[tex]n!=n(n-1)(n-2)(n-3)\ldots\ldots\ldots\text{.}[/tex]Thereofore,
[tex]n!=5\times4\times3\times2\times1=120\text{ways}[/tex]Answer:
