Seven people are interviewed for a possible promotion. In how many orders can the seven candidates be interviewed?

Question

Seven people are interviewed for a possible promotion. In how many orders can the seven candidates be interviewed?

I know the answer is 5040 but don't know how to get to it.

Answer 1

Hint: How many possibilities are there for the first interview? The second? Third? Etc.

Answer 2

The requires input into your scientific calculator.

7!= 5040