1. **Problem:** Draw $A$ or $B$ with an example. 2. **Formula used:** In set notation, “or” means the union, written as $A\cup B$. 3. **Important rule:** The union contains every element that is in $A$, in $B$, or in both sets. 4. **Example:** Let $A=\{1,2,3\}$ and $B=\{3,4,5\}$. 5. **Work:** $$A\cup B=\{1,2,3,4,5\}$$ The number $3$ is in both sets, but it is listed only once in the union. 6. **Final answer:** $A\cup B$ is the set of all elements from both $A$ and $B$, so for the example above the answer is $\{1,2,3,4,5\}$.