Answer :

Here,A={1,2,3} and B={3,4,5}


AB={1,2,3}{3,4,5}


={1,2,3}{3}


={1,2}


BA={3,4,5}{1,2,3,4}


={3,4,5}{3}


={4,5}


AΔB=(AB)(BA)


={1,2}{4,5}


={1,2,4,5}

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