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

$1 \in A$

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

The statement $1 \in A$ is correct because $1$ is an element of $A$.

Similar Questions

From the sets given below, select equal sets:

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Let $S=\{1,2,3,4\}$. The total number of unordered pairs of disjoint subsets of $S$ is equal to

  • [IIT 2010]

Which of the following are sets ? Justify your answer.

The collection of questions in this chapter.

Which of the following are sets ? Justify your answer.

The collection of all natural numbers less than $100 .$

Make correct statements by filling in the symbols $\subset$ or $ \not\subset $ in the blank spaces:

$\{ x:x$ is an even natural mumber $\}  \ldots \{ x:x$ is an integer $\} $