## Thinking Mathematically (6th Edition)

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The set $\left\{1, 2, 3, 4, ..., 99, 100\right\}$ contains all the counting numbers from 1 to 100. $93$ is a counting number that is less than $100$. Thus, $93$ is an element of the given set above. Therefore, $93 \in \left\{1, 2, 3, 4, ..., 99, 100\right\}$