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Let A = {1, 2, {3, 4}, 5}. Which of the following statements are true?

{3, 4} ⊂ A;
{3, 4} ∈ A;
{{3, 4}} ⊄ A;
{1, 3, 5} ⊂ A.

Correct Answer: {3, 4} ∈ A;

Explanation:

NA

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