Customer account numbers consist of 4 letters followed by 2 numbers. How many different account numbers are possible if repetitions of letters and digits are allowed?

Answer 1

You have 26 choices for each of the first 4 slots and 10 choices for each of the last 2 slots so total possibilities is (26)^4 x (10)^2= 100. X (26)^4 = 45697600