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Mathematics for IGCSE & O level - Sets (Section 2 - No. 31)

Which statement is an example of De Morgan's Law?
A ∩ B = B ∩ A
(A ∪ B)' = A' ∩ B'
A ∪ B = B ∪ A
(A ∩ B) ∪ C = A ∩ (B ∪ C)

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(A ∪ B)' = A' ∩ B'

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