Let $A=\{1,2,\{3,4\}, 5\} .$ Which of the following statements are incorrect and why ?

$\{ \{ 3,4\} \}  \subset A$

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$A=\{1,2,\{3,4\}, 5\}$

The statement $\{\{3,4\}\}\subset A$ is correct because $\{3,4\}\in\{\{3,4\}\}$ and $\{3,4\}\in A$

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Let $A=\{1,2,\{3,4\}, 5\} .$ Which of the following statements are incorrect and why ?

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