Prove that : AsubeB ,BsubeCa n dCsubeA A...

Prove that : `AsubeB ,BsubeCa n dCsubeA A=Cdot`

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We know,,A is subset of B and B is subset of C
so,`AsubeC`[By transitive property of subset]
Also,`CsubeA`
Therefore,`C=A`

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