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we are subtracting the set A from B i.e. all the elements of B should not be included
we are subtracting B from A i.e. all the elements of A should not be included

*if the two sets contain any common element then it should be eliminated

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If A ={5,10,15,20} and {2,4,6,8} then A-B={5,10,15,20},B-A={2,4,6,8}

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