Answer
Combination.
Work Step by Step
If the order is important, then it is a permutation, but if the order is not important, it is a combination. Here, it is not important, therefore it is a combination.
Essentials of Statistics (5th Edition)
by Triola, Mario F.
Published by
Pearson
ISBN 10:
0-32192-459-2
ISBN 13:
978-0-32192-459-9
Chapter 4 - Probability - 4-6 Counting - Page 180: 2
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