How will you define a set of all real numbers?

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Question:How will you define a set of all real numbers?

1.{x: -1 < x < 1}

2.[x: -∞ < x < ∞]

3.{x: -∞ < x < ∞}

4.{x: -Z < x < +Z}

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  1. How will you define a set of all real numbers?
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