Which of the following collections are sets? Justify your answer: (i)The collection  of prime integers.(ii) The collection of easy sub topics in this chapter. (iii) The collection of good teachers in your school. (iv) The collection of girls in your class. (v) The collection of odd natural numbers.

Explanation

As we know the definition of set that it is a group or collection of distinct numbers, considered as an object on its own right. Option (i),(iv)and(v) come under group of same entities. But remaining are not come in set . Hence (i),(iv),(v) are correct.