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Use the Fundamental Counting Principle to solve Exercises.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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Use the Fundamental Counting Principle How many different four-letter radio station call letters can be formed if the first letter must be $\mathrm{W}$ or $\mathrm{K} ?$
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Use the fundamental principle of counting or permutations to solve each problem. How many different 4-letter radio-station call letters can be made under the following conditions? (Disregard the fact that some may be unacceptable for various reasons.) (a) The first letter must be $\mathrm{K}$ or $\mathrm{W}$, and no letter may be repeated. (b) Repetitions are allowed (but the first letter is $\mathrm{K}$ or $\mathrm{W}$ ). (c) The first letter must be $\mathrm{K}$ or $\mathrm{W}$, the last letter must be $\mathrm{R},$ and repetitions are not allowed.
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