Which one of the following is a null set?
A = {x : x is prime}
B = {x : x + 8 = 8}
C = {x : x2 + 1 = 0, x is a real number}
D = {x : x2 = 4, x is an integer}
1
C
2
D
3
A
4
B
Which one of the following is a null set?
A = {x : x is prime}
B = {x : x + 8 = 8}
C = {x : x2 + 1 = 0, x is a real number}
D = {x : x2 = 4, x is an integer}