Question

How many ID cards can be made if there are six digits and no digit can be used more than once

Answer 1

There are 720 possible ID cards that can be made with six digits and no digit used more than once. This is because the number of permutations of six different digits is 6 factorial, which is equal to 720 (6 x 5 x 4 x 3 x 2 x 1 = 720).