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Let A,B and C be three sets. Show by mea...

Let A,B and C be three sets. Show by means of examples that each of the following statements is true:
if `B inA and x inB" then "x in A`

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The correct Answer is:
If `A={y,{x},z},B={x}" then, "B in A and x in B` but `x in A.`
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