2012 · Q32
Which one of the following is a null set?
Elementary MathematicsNumber System
- AA = {x is a real number : x > 1 and x < 1}
- BB = {x : x+3 = 3}
- CC = {phi}
- DD = {x is a real number : x >= 1 and x <= 1}
Explanation
Only A is empty; B = {0}, C = {phi} and D = {1} are non-empty.