# Putting Things Together

## OBJECTIVE: To learn set operations

In previous lessons, you learned set vocabulary—definition and classification of sets, methods of naming sets, cardinality and comparison of sets, ﻿and definition and classification of subsets. Setting the Table: https://www.geogebra.org/m/eqajxyqr Counting with Your Fingers: https://www.geogebra.org/m/kmqughqr Taking Things Apart: https://www.geogebra.org/m/zjna6wa9 In this lesson, you're going to learn about operations involving sets. SET VOCABULARY The sets below will be used to cite examples for the new set vocabulary. Given: A = {1, 2, 3, 4, 5} B = {3, 4, 5, 6, 7} C = {1, 3, 5, 7} D = {2, 4, 6} NOTE: A and B are joint sets; C and D are disjoint sets. Union of Two Sets—set containing all the elements contained in either set or both sets, denoted by Examples: A B = {1, 2, 3, 4, 5, 6, 7}, C D = {1, 2, 3, 4, 5, 6, 7} Intersection of Two Sets—set containing only the elements contained in both sets, denoted by Examples: A B = {3, 4, 5}, C D = { } or ∅ Difference of Two Sets—set containing the elements contained in one set, but not in the other set, denoted by - Examples: A - B = {1, 2}, B - A = {6, 7} NOTE: Union, intersection, and difference of sets may be extended to more than two sets.
Below is a set of problems involving set operations.

## In this lesson, you learned how to find the union, intersection, and difference of two sets.

In a future lesson, you'll learn how to represent sets and perform set operations using a Venn Diagram. Did you ENJOY today's lesson?