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

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1.Set Theory

easy

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

$\{1,2,5\}\in A$

Option A

Option B

Option C

Option D

Solution

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

The statement $\{1,2,5\}\in A$ is incorrect because $\{1,2,5\}$ is not an element of $A$

Standard 11

Mathematics

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