If A and B are two sets, then (A-B)UB is......
AUB
B
А
ANB
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B={1,2,3} A-B={4,5} .........(the elements which are in A but not in B) by taking L.H.S ... If x ∈ B then x ∈ A U B, from which it follows that x ∈ A U B.
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