Let $A=\{1,2,\{3,4\}, 5\} .$ Which of the following statements are incorrect and why ?
$\{ \{ 3,4\} \} \subset A$
Let $A=\{1,2,\{3,4\}, 5\} .$ Which of the following statements are incorrect and why ?
$\{ \{ 3,4\} \} \subset A$
$A=\{1,2,\{3,4\}, 5\}$
The statement $\{\{3,4\}\}\subset A$ is correct because $\{3,4\}\in\{\{3,4\}\}$ and $\{3,4\}\in A$
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