(i) The collection of all the months of a year beginning with die letter “J”.

There are 3 months as , and beginning with letter ‘J’. Therefore, it is a well defined collection of months and hence it is a set.

(ii) The collection of ten most talented writers of India.

The concept of talented writers of India is vague, since there is no given for deciding whether a particular writer is talented or . Hence, the given collection is not a .

(iii) A team of eleven best cricket batsmen of the world.

A team of eleven best cricket batsmen of the world is vague, since there is no rule given for deciding whether a particular batsman is the . Hence, the given collection is not a .

(iv) The collection of all boys in your class.

The collection of all boys in my class is well defined. Hence, the given collection is a .

(v) The collection of all even integers.

The collection of all even integers i.e., (2, 4, 6, 8, ……) is well defined. Hence, the given collection is a .