Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)

Published by Pearson
ISBN 10: 0-32193-104-1
ISBN 13: 978-0-32193-104-7

Chapter 12 - Counting and Probability - Section 12.2 Permutations and Combinations - 12.2 Assess Your Understanding: 32

Answer

$25$

Work Step by Step

A,B,C,D and E are 5 distinct objects from which we should make 2-letter codes. This implies, n=5. Since repetition is allowed, the number of two letter codes is: $= n(n) \\= 5(5) \\= 25$
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