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 incorrect because $3 \in\{3,4\}$; however, $3 \notin A$

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