Problema Solution
Kareem is choosing a
3
-letter password from the letters A, B, C, D, and E. The password cannot have the same letter repeated in it. How many such passwords are possible?
Answer provided by our tutors
6*C(5,3) = 6*5!/(3!(5 - 3)!) = (6*4*5)/2 = 60
60 such passwords are possible.