Answer
subset, $\subseteq$.
Work Step by Step
If all the elements in a set are also elements in another set (apart from possibly other elements) then this is a subset, with notation $\subseteq$.
Precalculus (10th Edition)
by Sullivan, Michael
Published by
Pearson
ISBN 10:
0-32197-907-9
ISBN 13:
978-0-32197-907-0
Chapter 13 - Counting and Probability - 13.1 Counting - 13.1 Asses Your Understanding - Page 847: 5
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