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

any guesses ?

Answer 2

my guess is that its the 2nd one

Answer 3

why is that ?

Answer 4

just looks right.

Answer 5

you told me to guess i was told to guess

Answer 6

hmm..
what do you understand by the expression x>0 ?

Answer 7

nothing.

Answer 8

why don't you consult a book then ?