SOLUTION: Set a question to prove that (AUB)UC=AU(BUC)

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Question 1209653: Set a question to prove that (AUB)UC=AU(BUC)
Answer by CPhill(1959) About Me  (Show Source):
You can put this solution on YOUR website!
Prove that for any sets A, B, and C, the following equality holds:
(A ∪ B) ∪ C = A ∪ (B ∪ C)