# Chapter R - Review of Basic Concepts - R.1 Sets - R.1 Exercises - Page 7: 37

$\not \in$

#### Work Step by Step

The symbol $\in$ means that the number/expression is an element of the set. The symbol $\not \in$ means that the number/expression is NOT an element of the set. $0$ is not an element of the stet on the right so the missing symbol in the blank is $\not \in$.

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