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.