3-8 Unions and Intersections of Sets

3-8 Unions and Intersections of Sets

Page 214

10/27/20

Union

The union of two or more sets is the set that contains all elements of the sets.

Symbol: U

To find the union list the elements that are in both sets but do not repeat if they are in both sets.

Problem 1 Got it?

We will do problem 1 got it together! Look back at Teams for the shared screen.

Multiple Choice

A = {1, 3, 5, 7, 9}

B = {2, 3, 5, 7}

What is A ∪ B ?

• {3, 5, 7}

• {2, 3, 5, 7, 9}

• {2, 3, 5, 7}

• {1, 2, 3, 5, 7, 9}

Multiple Choice

The union of set A and set B,  $A\cup B$ , is the set consists of 

• all the elements in set A and set B.

• the common elements in set A and set B.

• all the elements in set A but not in set B.

• all the elements in set B but not in set A.

Intersection

The intersection of two or more sets is the set of elements that are common to every set.

Symbol

 $\cap$  

Disjoint Sets

Disjoint sets have no elements in common.

The intersection of disjoin sets is the empty set.

Problem 2 Got it?

Head over to Teams shared screen so we can work on Problem 2 Got it together!

Think about this!