Answer:
The universal set is a set that consists of all the elements of its subsets, including its own elements. Thus, the universal set U = {1, 2, 3, 4, 5, 6, 7, 8, 9}. Therefore, the universal set U = {1, 2, 3, 4, 5, 6, 7, 8, 9}.
universal set.set which contains all the elements or objects of other sets, including its own elements. for example:U={1,2,3,4,5,6}
A={1,2}
A subset of U
