Question

Which of the following has no solution?

{x | x < 0} and {x | x > 0}
{x | x ≤ 0} and {x | x ≥ 0}
{x | x ≤ 0} or {x | x ≥ 0}

Answer 1

Hi!!

Answer 2

i would go with the first one because x cannot be both greater than zero and at the same time less than zero!