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Question

If AB=ϕ and BA=ϕ, then A and B are _________

A
Overlapping
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B
Equivalent
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C
Disjoint
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D
Equal
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Solution

The correct option is A Equal
If AB=ϕ then this means all the elements of A are in B.
Similarly, If BA=ϕ then this means all the elements of B are in A
Hence this implies A=B

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