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