To solve the present problem we can just use a formula use the following strategy:
For the first choice, there are 7 possibilities (all the 7). For the second choice, there are 6 possibilities (all the 7 less the first already chosen). For the third choice 5, then 4, and 3. From this, we know that the number of possible arranges is the multiplication of these numbers.
[tex]\begin{gathered} N=7\times6\times5\times4\times3 \\ \\ N=2,520 \end{gathered}[/tex]Because the order is something thar is important, we concluded that the correct answer is: A. 2,520
