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:
$= n(n)
\\= 5(5)
\\= 25$
Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)
by Sullivan III, Michael
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 - Page 875: 32
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