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For this Venn diagram:

Find \(A \cup B\).

\(A \cup B = \{1, 3, 4, 5\}\)
\(A \cup B = \{1, 2, 3, 4, 5, 6\}\)
\(A \cup B = \{2, 4, 6\}\)
\(A \cup B = \{1, 3, 4\}\)