Answer
See below
Work Step by Step
The number of ways you can pick 18 selective courses out of 30 is: $_{30} C_{18}=\frac{30!}{(30-18)!.18!}=\frac{30!}{12!.18!}=86,493,225$
Algebra 2 (1st Edition)
by Larson, Ron; Boswell, Laurie; Kanold, Timothy D.; Stiff, Lee
Published by
McDougal Littell
ISBN 10:
0618595414
ISBN 13:
978-0-61859-541-9
Chapter 10 Counting Methods and Probability - Mixed Review of Problem Solving - Page 705: 6
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