Question

Let \[A = \left\{ \phi, \left\{ \phi \right\}, 1, \left\{ 1, \phi \right\}, 2 \right\}\] Which of the following are true? \[\left\{ 1 \right\} \in A\]

Answer 1

False
The correct form would be

\[\left\{ 1 \right\} \subset A\]