Answer
false
Work Step by Step
The set $\left\{999\right\}$ has only one element: the number $999$.
Thus, $9$ is not an element of the given set above.
Therefore, the given statement is false.
Precalculus (6th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
013421742X
ISBN 13:
978-0-13421-742-0
Chapter R - Review of Basic Concepts - Chapter R Test Prep - Review Exercises - Page 81: 4
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