Discussion
If A = {1, 2, 3, 4} and B = {3, 4, 5, 6}, what is A ∪ B?
Answer: B
The union collects every element of either set, listed once.
\[ A \cup B = \{1, 2, 3, 4, 5, 6\} \]
3 and 4 belong to both but are not repeated.
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