Question

You decide to lock your phone so no one can read your text messages. Using any 4 digits, how many passwords can you make using any number 0-9? (digits can be used more than once)

Answer 1

is that the answer?

Answer 2

Yes, there are 10000 permutations that may be used as password.

Answer 3

what work would i show?

Answer 4

you have ten different digits. If WXYZ is the code,
Each digit can have any place from the WXYZ. So the answer is 10^4