Mathematics: A Discrete Introduction - 3 Edition - Chapter 2 - Problem 1
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# The call sign for a radio station in the United States is a list of three or four

Mathematics: A Discrete Introduction | 3rd Edition

Problem 1

The call sign for a radio station in the United States is a list of three or four letters, such as WJHU or WJZ. The first letter must be a W or a K, and there is no restriction on the other letters. In how many ways can the call sign of a radio station be formed?

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