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The problem asks to find the cardinality of \( B - A \) using the Venn diagram.

- \( B \) represents the elements in the set \( B \) (the blue circle).
- \( A \) represents the elements in the set \( A \) (the red circle).
- \( B - A \) refers to the elements that are in \( B \) but not in \( A \).

### From the diagram, the elements in \( B \) that are not in \( A \) are:
- \( e \)
- \( y \)
- \( 12 \)
- \( 16 \)

These are the elements in the region of \( B \) that do not overlap with \( A \).

### Cardinality:
The cardinality \( n(B - A) \) is the number of elements in the set \( B - A \). Therefore:
\[
n(B - A) = 4
\]

If you have any questions or want further details, let me know!

Here are five related questions to expand on this concept:
1. How would you find \( n(A - B) \)?
2. What is the cardinality of \( A \cup B \) in the Venn diagram?
3. How do you calculate \( n(A \cap B) \)?
4. Can you find the cardinality of the universal set \( U \)?
5. What is the difference between \( A \cup B \) and \( A \cap B \)?

**Tip:** When analyzing Venn diagrams, pay close attention to the overlapping and non-overlapping areas to distinguish between sets and their intersections.

Use the following Venn diagram to find the cardinality of the indicated set: n(B - A).

Learn how to find the cardinality of the set B - A using Venn diagrams. This problem explores key concepts in set theory, such as set differences and cardinality, suitable for students in Grades 6-8.

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