Question

Which of the following has no solution?

{x | x ≤ 1} and {x | x ≥ 1}
{x | x < 1} and {x | x > 1}
{x | x ≤ 1} or {x | x ≥ 1}

Answer 1

{x | x ≤ 1} and {x | x ≥ 1} then x=1
{x | x < 1} and {x | x > 1} has no solution
{x | x ≤ 1} or {x | x ≥ 1} then x is every real number

Answer 2

thnxxx man youre an expert