Here’s this week’s practice question (regular multiple choice, just one answer), we’ll be posting the answer tomorrow. Good luck!
A popular website requires users to create a password consisting of digits only. If no digit may be repeated and each password must be at least 9 digits long, how many passwords are possible?
- 9! + 10!
- 2 x 10!
- 9! x 10!
Update: Answer/Explanation post!