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If A - B =phi phi and B-A = phi then wh...

If `A - B =phi phi and B-A = phi ` then what can we conclude ?

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The correct Answer is:
A=B
We have A B = `phi`, which means that all the elements of set A are 10.common with elements of set B.
Also, B - A =`phi`, which means that all the elements of set B are common with elements of set A.
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