Consider U={x|x is a positive integer greater than 1}. Which is an empty set?
A
start set x such that x is in cap u and 1 half x is prime end setB
start set x such that x is in cap u and 2 x can be written as A fraction end setC
start set x such that x is in cap u and 2 x is prime end setD
start set x such that x is in cap u and 1 half x can be written as A fraction end set