Use the fundamental principle of counting or permutations to solve the problem. How many different 4-letter radio-station

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Use the fundamental principle of counting or permutations to solve the 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 K or W, and no letter may be repeated.

(b) Repetitions are allowed (but the first letter is K or W).

(c) The first letter must be K or W, the last letter must be R, and repetitions are not allowed.

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Related Book For  answer-question

College Algebra

ISBN: 978-0134697024

12th edition

Authors: Margaret L. Lial, John Hornsby, David I. Schneider, Callie Daniels

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