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Question
Let \[A = \left\{ \phi, \left\{ \phi \right\}, 1, \left\{ 1, \phi \right\}, 2 \right\}\] Which of the following are true? \[\left\{ 1 \right\} \in A\]
Solution
False
The correct form would be\[\left\{ 1 \right\} \subset A\]
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