Say your kid forgot the combination.
Say there were 3 digits, each with 9 options...
That means 789 possibilities to try, right?
[Edited to add:]
Say you are an idiot and calculated wrong.
Say there were 3 digits each with 10 options...
That means ONE THOUSAND possibilities to try, right?!
WHY ARE ALL MY STATUSES ABOUT MATH TODAY?!?!