The question asks us to find the elements in the set $A \cap B$, which represents the intersection of sets $A$ and $B$. The intersection contains elements that are common to both sets.

From the Venn diagram:

• Elements of set $A$ include: $4, 9, 3, 6, 2, 1$.
• Elements of set $B$ include: $2, 8, 1, 9, 7$.

The intersection $A \cap B$ is represented by the overlapping section of the two circles in the Venn diagram, which includes the numbers that appear in both sets.

The common elements between sets $A$ and $B$ are:

$A \cap B = \{ 9, 2, 1 \}$

So, the answer is:

$A \cap B = \{ 9, 2, 1 \}$

Would you like more details or have any questions?

Here are some related questions:

1. How do you find the union of two sets?
2. What does the complement of a set represent in a Venn diagram?
3. How can you determine the difference between two sets using a Venn diagram?
4. How do you represent subsets using Venn diagrams?
5. What are the properties of set operations such as intersection and union?

Tip: When working with Venn diagrams, always identify which section represents the operation you're interested in (intersection, union, difference, etc.) to find the correct elements.