Question: Use the Venn diagram to determine the set $A' \cap B$.
1. **State the problem:** We need to find the elements in the set $A' \cap B$, which means the elements that are in $B$ but not in $A$.
2. **Recall definitions:**
- $A'$ (the complement of $A$) contains all elements not in $A$.
- $A' \cap B$ means elements that are in $B$ and also not in $A$.
3. **Analyze the Venn diagram:**
- Elements in $A$ only: $\$, $%$
- Elements in $A \cap B$: $\Delta$
- Elements in $B$ only: $3$, $6$, $9$
- Elements outside both $A$ and $B$: $12$, $02$
4. **Find $A' \cap B$:**
- These are elements in $B$ but not in $A$, so exclude $\Delta$ (intersection).
- The elements are $3$, $6$, $9$.
5. **Final answer:**
$$A' \cap B = \{3,6,9\}$$