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     EduGorilla 
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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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