Question

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

Answer 1

Hello,

Codes are :
5_6_7, 5_7_6

6_5_7,6_7_5

7_5_6,7_6_5

Choising the first (3 possibilities)
next choising the second (2 possibilities)
chosing the last  (1 possibility)

So 3*2*1=6

Answer A