There is this question. There are six different candidates for governor of a state. In how many different orders can the names if the candidates be printed on a ballot?
The answer is $6!=720$. But why?
If there are $6$ candidates and order matters, they are being placed on $1$ card. Wouldn't it be $p(6,1)=6$ ways?
The given answer is correct.
You have $6$ choices for the first name.
For each of the $6$ choices, you have $5$ choices for the second name, and so on.
So, by the multiplication principle, we have that there are $6!$ ways to print the names.