Answer
See explanation below.
Work Step by Step
$C(n,r)$ is the number of ways we can choose $r$ items out of $n$. The number of ways can only be a whole number. (Because obviously there is no such thing as 3.5 ways)
Finite Math and Applied Calculus (6th Edition)
by Waner, Stefan; Costenoble, Steven
Published by
Brooks Cole
ISBN 10:
1133607705
ISBN 13:
978-1-13360-770-0
Chapter 6 - Section 6.4 - Permutations and Combinations - Exercises - Page 440: 78
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