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De Morgan’s Law are based on complement of sets

- (A ∪ B)´ = A′ ∩ B′
- (A ∩ B)′ = A′ ∪ B′

Let us prove the law by Venn Diagrams

Let's take two sets A and B like

## Proving (A ∪ B)´ = A′ ∩ B′

## Proving (A ∩ B)′= A′ ∪ B′