## Thinking Mathematically (6th Edition)

Published by Pearson

# Chapter 2 - Set Theory - Chapter Summary, Review, and Test - Review Exercises - Page 108: 7

#### Answer

The set is empty.

#### Work Step by Step

In the given set, $x$ is defined as a number that is less than 4 and at the same time, greater than or equal to 6. Note that a number cannot be both less than $4$ and greater than or equal to $6$ at the same time. Thus, the set is empty.

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