## Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)

$(A\cup B)\cap C=\{1,3,4,6\}$
In Exercise 9, we found: $A\cup B=\{1,2,3,4,5,6,7,8,9\}$. $(A\cup B)\cap C$ is the set of elements that are common to $(A\cup B)$ and $C$. Thus, $(A\cup B)\cap C=\{1,3,4,6\}=C$