For any two sets A and B, prove that: A B = ϕ A B’.

Let x be any element of Set A


And y be any element of Set B


Now x≠y A B = ϕ


This means no element of B should be in A.


Thus, x is an element of A and an element of B’


As x ϵ B’


A B’


Hence, Proved.


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