Answer
Well defined
Work Step by Step
College administration has the date of births of students enrolled. These elderly students can be considered under the set. So it is well defined.
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 - 2.1 Basic Set Concepts - Exercise Set 2.1 - Page 58: 4
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