Asked by Mimi

Prove that (A ∩ B) ∪ C= A ∩ (B ∪ C) if and only if C ⊆ A. I really need some help on structuring the proof!
Answered by Steve
You know that

(A ∩ B) ∪ C = A∪C ∩ B∪C

Now when is A∪C = A?
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