Question

define set with example

Answer 1

the combination or collection of things is called set..
each element is called entry..
e.g.
A={1,2,3,4,5,6,7,8,9}
B={set of 1st ten odd no.s}
C={set of 31 days month in solar calender}
and so...

Answer 2

{ something inside } is a set, { nothing inside} is a set also (it is an empty set).
The notation of "set" is { }
real example, school set is set of schools, you have {elementary schools, junior high schools, private schools, public schools}
set of class: {grade1 class, grade2 class, grade4, }