SOLUTION: How many different four-letter radio station call letters can be formed if the first letter must be W or K?

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Question 574720: How many different four-letter radio station call letters can be formed if the first letter must be W or K?
Answer by ad_alta(240) About Me  (Show Source):
You can put this solution on YOUR website!
We only have two choices for the first letter, while we have 26 choices for the next three. Therefore there are 2*26^3 or 35152 choices.