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More lessons on Sets

Intersection of Two Sets

Intersection of Three Sets

**What is a Venn Diagram?**

A Venn Diagram is a pictorial representation of the relationships between sets.

We can represent sets using**Venn diagrams**. In a Venn diagram, the sets are represented by shapes; usually circles or ovals. The elements of a set are labeled within the circle.

The following diagrams show the set operations and Venn Diagrams for Complement of a Set, Disjoint Sets, Subsets, Intersection and Union of Sets. Scroll down the page for more examples and solutions.

The set of all elements being considered is called the**Universal Set (U)** and is represented by a rectangle.

The**complement of A, A'**, is the set of elements in U but not in A. A' ={x| x ∈ U and x ∉ A}

Set A and B are**disjoint sets** if they do not share any common elements.

B is a**proper subset** of A. This means B is a subset of A, but B ≠ A.

The**intersection of A and B** is the set of elements in both set A and set B. A ∩ B = {x| x ∈ A and x ∈ B}

The**union of A and B** is the set of elements in set A or set B. A ∪ B = {x| x ∈ A or x ∈ B}

A ∩ ∅ = ∅

A ∪ ∅ = A

**Set Operations and Venn Diagrams**

Example:

1. Create a Venn Diagram to show the relationship among the sets.

U is the set of whole numbers from 1 to 15.

A is the set of multiples of 3.

B is the set of primes.

C is the set of odd numbers.

2. Given the following Venn Diagram determine each of the following set. a) A ∩ B

b) A ∪ B

c) (A ∪ B)'

d) A' ∩ B

e) A ∪ B'

**Solution: **

List out the elements of*P*.

* P = * {16, 18, 20, 22, 24} ← ‘between’ does not include 15 and 25

### Venn Diagram Videos

What's a Venn Diagram, and What Does Intersection and Union Mean?
#### Venn Diagram two Subsets

Learn about Venn diagrams with two subsets.
#### Venn Diagram Two Subsets Using Regions

Learn about Venn diagrams with two subsets using regions.
#### Venn Diagrams With Three Subsets

Learn about Venn diagrams with three subsets.

You can use the free Mathway calculator and problem solver below to practice Algebra or other math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations.

More lessons on Sets

Intersection of Two Sets

Intersection of Three Sets

A Venn Diagram is a pictorial representation of the relationships between sets.

We can represent sets using

The following diagrams show the set operations and Venn Diagrams for Complement of a Set, Disjoint Sets, Subsets, Intersection and Union of Sets. Scroll down the page for more examples and solutions.

The set of all elements being considered is called the

The

Set A and B are

B is a

The

The

A ∩ ∅ = ∅

A ∪ ∅ = A

Example:

1. Create a Venn Diagram to show the relationship among the sets.

U is the set of whole numbers from 1 to 15.

A is the set of multiples of 3.

B is the set of primes.

C is the set of odd numbers.

2. Given the following Venn Diagram determine each of the following set. a) A ∩ B

b) A ∪ B

c) (A ∪ B)'

d) A' ∩ B

e) A ∪ B'

**Example: **

Given the set *P* is the set of even numbers between 15 and 25. Draw and label a Venn diagram to represent the set *P* and indicate all the elements of set *P* in the Venn diagram.

List out the elements of

Draw a circle or oval. Label it *P* . Put the elements in *P*.

**Example: **

Draw and label a Venn diagram to represent the set

*R *= {Monday, Tuesday, Wednesday}.

**Solution: **

Draw a circle or oval. Label it *R* . Put the elements in *R*.

**Example: **

Given the set *Q* = {*x* : 2*x* – 3 < 11, *x* is a positive integer }. Draw and label a Venn diagram to represent the set *Q*.

**Solution: **

Since an equation is given, we need to first solve for *x*.

2*x* – 3 < 11 ⇒ 2*x* < 14 ⇒ *x* < 7

So, *Q* = {1, 2, 3, 4, 5, 6}

Draw a circle or oval. Label it *Q* .

Put the elements in *Q*.

Rotate to landscape screen format on a mobile phone or small tablet to use the **Mathway** widget, a free math problem solver that **answers your questions with step-by-step explanations**.

You can use the free Mathway calculator and problem solver below to practice Algebra or other math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations.

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