Which of the following sets is the null set `phi`? Briefly say why?
`B={x:x +3 =3}`

Which of the following sets is the null set phi ? Briefly say why? C={phi}

Which of the following sets is the null set phi ? Briefly say why? A={x:x " is" gt1 and x " is" lt 1}

Which of the following sets are null sets? B={0},

State which of the following is a null set?

State which of the followings are null set?

Which is null set?

Which of the following sets are null sets? C={ x: x in W and -3 lt x lt -2 },

Which of the following sets are null sets? D={ x:x is a prime number and 6 lt x lt 8 }.

Which of the following sets are null sets? A=( n:n in N and n lt 4 and n gt 7 },

Find which of the following sets are infinite and which are infinite sets: B={x:x is a positive whole number and x lt 7 },