Question

How many four-character passwords can be formed using the characters A, B, C, 1, 2 if the characters can be repeated

Answer 1

Answer: 625

Work Shown:

The set {A,B,C,1,2} has five items. There are four slots to fill.

So we have 5^4 = 5*5*5*5 = 625 different possible passwords where the characters can be repeated.