Which of the following is an empty set?….

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Which of the following is an empty set?

Options :-

1. {x | x is a real number and x² – 1 = 0}
2. {x | x is a real number and x² + 1 = 0}
3. {x | x is a real number and x² – 9 = 0}
4. {x | x is a real number and x² = x + 2}

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