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Discrete structures A(BA)=AB Step 1 Then we get, x belongs to AB by the definition of union. Step 2 Which means, x belong to A

Discrete structures

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A(BA)=AB Step 1 Then we get, x belongs to AB by the definition of union. Step 2 Which means, x belong to A and x not belong to B. Which means, x belong to A or x belong to B. Suppose that x belongs to A(BA). Step 4 Then x belong to either A or x belong to BA

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