Identify Sets (Part-1) - Solution Video Lecture | Study Sets and Functions - JEE | Best Video for JEE

let's discuss the solution to check if
the given collection is a set we just
need to see whether the members of the
collection are well defined or not if
the members of a collection are well
defined then it is a set collection of
all the months of a year the members of
this collection are the names of the 12
months clearly this collection is
well-defined and hence it is a set
collection of most dangerous animals of
the world the criterion for determining
an animal as dangerous will vary from
person to person so the members of this
collection are not well-defined and
hence it is not a set
collection of all the rivers of the
world this collection includes the names
of all the rivers of the world the
members of this collection are well
defined and hence it is a set