Answer
Given n = 2 and r = 3. Order is not important, so we use combination rule
5! / 3! (5-3)!
= 5! / 3! 2!
= 10
Work Step by Step
As given in answer
Statistics (12th Edition)
by McClave, James T.; Sincich, Terry T.
Published by
Pearson
ISBN 10:
0321755936
ISBN 13:
978-0-32175-593-3
Chapter 3 - Probability - Exercises 3.112 - 3.137 - Applying the Concepts - Basic - Page 162: 3.121a
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