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For this Venn diagram:

Find \(A \cup B'\).

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