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Answer variants:
Choose the associative property of union of sets for \(A\), \(B\) and \(C\) and find the set \(A \cup (B \cup C)\).
\(A\) \(=\) , \(B\) \(=\) and \(C\) \(=\)
1. Associative property of union of sets:
2. \(A \cup (B \cup C)\) \(=\) .
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