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Question

For any two sets A and B, prove that (A' - B') = (B - A).

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Solution

To prove: A'-B'=B-AProof:Let xA'-B'xA' & xB'xA & xBxB-AA'-B'B-A ...(i)Now, let xB-AxB & xAxB' & x A'xA'-B'B-AA'-B' ...(ii)Hence, from (i) and (ii), we have:A'-B'=B-A

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