Thinking Mathematically (6th Edition)

Published by Pearson
ISBN 10: 0321867327
ISBN 13: 978-0-32186-732-2

Chapter 11 - Counting Methods and Probability Theory - 11.3 Combinations - Exercise Set 11.3 - Page 709: 75

Answer

Makes sense.

Work Step by Step

Since the chosen letters are not arranged in any particular way (e.g. into a word), the order of the selection does not matter here. So, the problem involves the combination formula. Makes sense.
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