1. Which of the following are examples of the null set
(i) Set of odd natural numbers divisible by 2
(ii) Set of even prime numbers
(iii) {x:x is a natural numbers, x<5 and x>7}
(iv) {y:y is a point common to any two parallel lines \}$
(i) Set of odd natural numbers divisible by 2
(ii) Set of even prime numbers
(iii) {x:x is a natural numbers, x<5 and x>7}
(iv) {y:y is a point common to any two parallel lines \}$