Answer
$\notin$
Work Step by Step
Notice that the set {1, 2, 3, ...} begins at the number 1 and increases. Zero is less than the number one, and is therefore NOT included in the set.
Intermediate Algebra (6th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321785045
ISBN 13:
978-0-32178-504-6
Chapter 1 - Section 1.2 - Algebraic Expressions and Sets of Numbers - Exercise Set - Page 16: 42
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