Let A = { 1, 2, { 3, 4 }, 5 }. Which of...

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

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The correct Answer is:

as `{1,2, 5}⊂A`

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