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Empty Set

If A and B ar...

Question

If $A$ and $B$ are disjoint non-empty sets, then $A - (A - B)$ is

A

B

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B

ϕ

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C

A

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D

A \cup B

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Solution

The correct option is B $ϕ$
$A - B = A \Rightarrow A - (A - B) = A - A = ϕ$

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