How do you calculate permutations of numbers?
Permutations are arrangements of items, so the number of permutations is the number of arrangements of items.
How many 3-digit codes are possible if each digit is chosen from 0 through 9, and no digits are repeated.
We can think of 3-digits codes as permutations of
Hence, there are 720 possible 3-digit codes.
I hope that this was helpful.