To find the elements of $(A \cup B)'$, which is the complement of the union of sets $A$ and $B$, we need to follow these steps:

1. Union of $A$ and $B$ ($A \cup B$):

   • The union of two sets includes all elements in either $A$, $B$, or both.
   • From the Venn diagram:
     • Elements in $A$ are: $\{1, 3, 5, 7, 9\}$
     • Elements in $B$ are: $\{6, 7, 8, 9, 10\}$
   • The union $A \cup B = \{1, 3, 5, 6, 7, 8, 9, 10\}$

2. Complement of $A \cup B$ ($(A \cup B)'$):

   • The complement includes all elements in the universal set $U$ that are not in $A \cup B$.
   • Based on the Venn diagram, the elements outside sets $A$ and $B$ are $\{2, 4\}$.

So, the elements of $(A \cup B)'$ are $\{2, 4\}$.

Thus, the correct answer is:

• $\{2, 4\}$

Do you want more details or have any questions?

Here are 5 related questions to deepen understanding:

1. What is the difference between a union and an intersection of two sets?
2. How would you find $(A \cap B)'$ using a similar approach?
3. Can you explain how the universal set influences set complements?
4. What happens if the sets $A$ and $B$ are disjoint (have no elements in common)?
5. How does the concept of a complement change if the universal set is redefined?

Tip: When dealing with complements, always ensure you know the universal set's elements, as the complement is based on this.