The problem asks to find the union of sets $A$ and $B$, where:

• $A = \{2, 3, 4\}$
• $B = \{3, 4, 5\}$

The union of two sets $A$ and $B$, denoted by $A \cup B$, includes all unique elements that are in either $A$ or $B$ or both.

So,

$A \cup B = \{2, 3, 4, 5\}$

Therefore, $A \cup B = \{2, 3, 4, 5\}$.

Would you like more details or have any questions about this?

Here are some related questions to expand your understanding:

1. How do we find the intersection of two sets?
2. What is the difference between the union and intersection of sets?
3. How do we represent the complement of a set?
4. How can we use Venn diagrams to visualize unions and intersections?
5. What are subsets and supersets in set theory?

Tip: In set theory, the union of two sets combines all distinct elements from both sets without duplicates.