Mathematics for IGCSE & O level - Sets (Section 3 - No. 49)
Which of the following represents the De Morgan's Law?
(A ∪ B)' = A' ∪ B'
(A ∩ B)' = A' ∩ B'
(A ∪ B)' = A' ∩ B'
(A ∩ B) = A' ∪ B'
คำอธิบาย
De Morgan's Law states that the complement of a union is the intersection of the complements: (A ∪ B)' = A' ∩ B'.