Union & Intersection

Pre-Calculus Tutorial

Union & Intersection


Union, denoted by ∪, means the inclusion of ALL elements in a set.

Interxection, denoted by ∩, is the inclusion of elements that are the SAME.

Easy way to Remember:
Union is ALL Elements, pretty easy ?
Intersections is finding the same ones.

Let’s try an example!

Sample Problem

Set A = {A,E,I,O,U}
Set B = {A,B,C,D,E}

Find A ∪ B and A ∩ B


A ∪ B = {A,B,C,D,E,I,O,U} * Remember to write each element once in order. If they
were numbers, we would put them in numerical order

Step 1: Find all elements that are common in both sets. In this case the common letter of Set A and Set B are elements A and E. Therefore the intersection is…

A ∩ B = {A, E}

About The Author

Math Tutor
My name is Jeffrey Narcisse and I am a graduate of Sports and Medical Sciences Academy. I have been mentoring middle school students throughout my high school career and have also tutored many high school students in mathematics. The highest math class I have been in is AP Calculus AB and passed wit...
Send Email
6 Subjects
KnowRo Tutor
4 Tutorials
Hartford, CT

Suggested Tutors for Pre-Calculus Help


Varsity Tutors

(855) 475-5132 - Award-Winning Academic & Test Prep Tutors


Study Wizards

(408) 883-8660 5-Star Yelp and Google in-home tutoring


Link Educational Institute

Link Educational Institute

Lance L

Frederick, MD

Math, Chemistry And Physics Tutor

Leave a Comment

Your email address will not be published. Required fields are marked *