How can the union of two sets be found?

In set theory, the union of two sets, denoted by the symbol $\cup$, is defined as the collection of all elements that belong to either set $A$, set $B$, or both.12

To find the union of two sets, you combine all unique members from both sets into a single new set. If an element appears in both original sets, it is included only once in the resulting union.12

For example, if set $A=\{1,2,3,4,5\}$ and set $B=\{1,3,5,7,9\}$, the union $A\cup B$ is $\{1,2,3,4,5,7,9\}$. Similarly, if you have two committees with overlapping members, the union consists of every individual who is a member of at least one of the two committees, ensuring no individual is counted twice.12