Answer
n(B)=15
Work Step by Step
B={18,19,20,....,31,32}
In the given sets there are 15 elements. So the cardinal number is 15.
Thinking Mathematically (6th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0321867327
ISBN 13:
978-0-32186-732-2
Chapter 2 - Set Theory - Chapter Summary, Review, and Test - Review Exercises - Page 109: 11
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