# If A and B are se

Let x ϵ A and y ϵ B

A – B = The set of values of A that are not in B.

A B = The set containing common values of A and B

B – A = The set of values of B that are not in A.

Two sets X and Y are called disjoint if,

X Y = ϕ

(A – B) (A B) = ((A – B) A) ((A – B) B)

(A – B) (A B) = ϕ ϕ

(A – B) (A B) = ϕ

Similarly,

(B – A) (A B) = ((B – A) A) ((B – A) B)

(B – A) (A B) = ϕ

Hence, the three sets are pair wise disjoint.

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