Which of the following is a set
(1)
(1) The members of this collection are January, June and July. So, this collection is well defined and hence, it is a set.
(2) A writer may be most talented for one person and may not be for another person. So, this collection is not well defined. Hence, it is not a set.
(3) A batsman may be best for one person and may not be for another person. So, it is not well defined, hence it is not a set.
(4) The term most dangerous is not a clear term. An animal may be most dangerous to one person and may not be for another person. So, it is not well defined, hence it is not a set.