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Question

If A, B, C are three sets such that AB, then prove that CBCA

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Solution

We have , ACB

To show : CBCA

Let, x ϵ CB

x ϵ C and x/ϵA [AB]

x ϵ CA

Thus, x ϵ CBx ϵCA

This is true for all x ϵCB

CBCA


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