Solve the problem.
-How many different 4-letter radio-station call letters can be made if the first letter must be K or W, repeats are allowed, but the call letters cannot end in an O?

Question

Quizplus · Accepted Answer

There are 2 choices for the first letter, 26 choices for the second letter, 26 choices for the third letter, and 25 choices for the fourth letter (since it cannot end in O). So, the total number of different 4-letter radio-station call letters is 2 * 26 * 26 * 25 = 33,800.

Solve the Problem. -How Many Different 4-Letter Radio-Station Call Letters Can Be Made