Helllo,

I am supposed to do the following:

Mathematically, a set is said to be consists of well-defined elements. For

instance, the following are well-defined sets.A = {1, 2, 3, 4, 5, 6, 7}

B = {2, 3, 4, 8, 9}A set may be described using other types of expression; specially, if the

set has elements (members) that are numerous to list. There are a well-defined

operations that can be performed on sets.1. Determining a given set B is a subset of A, or not.

B is-a-subset-of A ==> false

2. Union of sets: finds all elements of both A and B and generates a unique

set.A union B = {1, 2, 3, 4, 5, 6, 7, 8, 9}

The teacher is no help at all. I still have no idea how to do this. Can anybody explain this to me?

Thank you!