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Question

For any two sets A and B, prove by using of properties of sets that (AB)A=BA, Also,
verify this result by taking example.

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Solution

We have
LHS=(AB)A=(AB)A=(AB)(BA)=ϕ(BA)=BA=BA=RHSLet A ={1,2,4,5,6}andB={3,5,6,8}Now, LHS=(AB)A={1,2,4,5,6}{3,5,6,8}{1,2,4,5,6}={1,2,3,4,5,6,8}{1,2,4,5,6}={3,8}and RHS=BA={3,5,6,8}1,2,4,5,6={3,8}LHS = RHS


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