Which of the following is an example of the null set?
$\{ y : y \text{ is a point common to any two parallel lines} \}$
$\{ y : y \text{ is a point common to any two parallel lines} \}$
(A) The set $\{ y : y \text{ is a point common to any two parallel lines} \}$ is a null set because parallel lines do not intersect. Therefore,they have no common point.
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