State which of the following sets are empty and which are not?
{x:x is a natural number, x`lt`5 and x `gt`7}

State which of the following sets are empty and which are not? Set of even prime numbers.

State which of the following sets are empty and which are not? Set of odd natural numbers divisible by 2.

State which of the following sets are empty and which are not? {x:x is a common point to any two parallel lines}

State which of the following are equations. x-3=7

State which of the following sets are empty {x:x is a natural number, x 8}

State the following set is empty or not. {x: x is a natural number, x 5}

State which of the following sets are finite and infinite. {x:x in N and x^2=4}

State which of the following sets are finite and infinite. {x:x in N and 2x-2=0}

State which of the following sets are finite and infinite. {x:x in N and x is odd}