(AUB)=(A-B)U(B-A)U(A intersection B)
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A-B = AnB'
B-A = BnA'
(A -B)U (B-A)= the elements that are only in A and B which are not common in A and B
(AnB)= elements common inA and B
(A -B)U (B-A)U(AnB)= elements in A and B and common for both = AuB
B-A = BnA'
(A -B)U (B-A)= the elements that are only in A and B which are not common in A and B
(AnB)= elements common inA and B
(A -B)U (B-A)U(AnB)= elements in A and B and common for both = AuB
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