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Question
For any two sets A and B, prove that: \[A \cap B = \phi \Rightarrow A \subseteq B'\]
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Solution
Let \[A \cap B = \phi \Rightarrow A \subseteq B'\]
\[\Rightarrow a \in B'\]
Thus,
\[a \in A \text{ and } a \in B' \Rightarrow A \subseteq B'\]
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