The Venn diagram in the image provides information for two sets, $A$ and $B$, with the values within each section.

Let's break down the elements:

• The value 29 represents the number of elements in $A$ that are only in $A$ (but not in $B$).
• The value 35 represents the number of elements in $B$ that are only in $B$ (but not in $A$).
• The value 28 represents the number of elements that are in both $A$ and $B$.
• The value 25 represents the number of elements that are in neither $A$ nor $B$.

Now, let's answer each part:

1. $n(A)$ - The total number of elements in $A$ (including those in $A \cap B$): $n(A) = 29 + 28 = 57$

2. $n(A \cup B)$ - The total number of elements in either $A$, $B$, or both: $n(A \cup B) = 29 + 28 + 35 = 92$

3. $n(B)$ - The total number of elements in $B$ (including those in $A \cap B$): $n(B) = 35 + 28 = 63$

4. $n(A \cap B)$ - The number of elements in both $A$ and $B$: $n(A \cap B) = 28$

Would you like further details or have any questions?

Here are some related questions to expand your understanding:

1. What is the value of $n(A^c \cap B)$?
2. How do you calculate $n(A^c \cup B)$?
3. What is the total number of elements in the universal set?
4. How can you find $n(A^c \cap B^c)$?
5. What is the formula for the union of three sets, if a third set $C$ is introduced?

Tip: When working with Venn diagrams, always make sure to include the intersection and exclusive regions carefully to avoid double-counting!