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UNION OF SETS -
Let A and B be any two sets. The union of A and B is the set which consists of all the elements of A and all the elements of B, the common elements being taken only once. The symbol ‘∪’ is used to denote the union.
- wherein
Symbolically, we write A U B = {x: x ∈ A or x ∈ B}.
De Morgans’s Law -
(A ∪ B)′ = A′ ∩ B′