Which of the expressions can you use to find the number of 3-digit passwords you can make using the digits 5, 6, and 7, if you do not repeat any of the digits?
3 x 2 x 1
3 + 2 + 1
5 x 6 x 7
5 + 6 + 7
3 x 2 x 1
3 + 2 + 1
5 x 6 x 7
5 + 6 + 7
