Answer
Verified
394.8k+ views
Hint: If one set is the subset of another set then their union will be the bigger set. Means we will get the set of which it is a subset.
Complete step-by-step answer:
Here in this problem we are given two sets to us as A and B.
It is also said that A is a subset of B. This denotes that all the elements that are there in A are also present in the set B.
Now, as per the definition of union of sets, we have, Union of two given sets is the smallest set which contains all the elements of both the sets.
To find the union of two given sets A and B is a set which consists of all the elements of A and all the elements of B such that no element is repeated.
The symbol for denoting union of sets is ‘\[ \cup \]’.
For Example:
Let set \[A{\text{ }} = {\text{ }}\left\{ {2,{\text{ }}4,{\text{ }}5,{\text{ }}6} \right\}\]
and set \[B{\text{ }} = {\text{ }}\left\{ {4,{\text{ }}6,{\text{ }}7,{\text{ }}8} \right\}\]
Taking every element of both the sets A and B, without repeating any element, we get a new set \[ = {\text{ }}\left\{ {2,{\text{ }}4,{\text{ }}5,{\text{ }}6,{\text{ }}7,{\text{ }}8} \right\}\]. This new set contains all the elements of set A and all the elements of set B with no repetition of elements and is named as union of set A and B.
So, as all the elements of A are there in B, we will have, \[A \cup B = B\].
Note: Note that if A is a subset of B then, B is called the super set of A.
The properties of union and intersection is defined like this,
1.Commutative properties
2.Associative properties
3.Identity property for union
4.Intersection property of the empty set
5.Distributive properties
Complete step-by-step answer:
Here in this problem we are given two sets to us as A and B.
It is also said that A is a subset of B. This denotes that all the elements that are there in A are also present in the set B.
Now, as per the definition of union of sets, we have, Union of two given sets is the smallest set which contains all the elements of both the sets.
To find the union of two given sets A and B is a set which consists of all the elements of A and all the elements of B such that no element is repeated.
The symbol for denoting union of sets is ‘\[ \cup \]’.
For Example:
Let set \[A{\text{ }} = {\text{ }}\left\{ {2,{\text{ }}4,{\text{ }}5,{\text{ }}6} \right\}\]
and set \[B{\text{ }} = {\text{ }}\left\{ {4,{\text{ }}6,{\text{ }}7,{\text{ }}8} \right\}\]
Taking every element of both the sets A and B, without repeating any element, we get a new set \[ = {\text{ }}\left\{ {2,{\text{ }}4,{\text{ }}5,{\text{ }}6,{\text{ }}7,{\text{ }}8} \right\}\]. This new set contains all the elements of set A and all the elements of set B with no repetition of elements and is named as union of set A and B.
So, as all the elements of A are there in B, we will have, \[A \cup B = B\].
Note: Note that if A is a subset of B then, B is called the super set of A.
The properties of union and intersection is defined like this,
1.Commutative properties
2.Associative properties
3.Identity property for union
4.Intersection property of the empty set
5.Distributive properties
Watch videos on
If A and B are two sets such that \[A \subset B\] then what is \[A \cup B?\]
Class 11 MATHS NCERT EXERCISE 1.4 (Question - 3) | Sets Class 11 Chapter 1 | NCERT | Ratan Kalra Sir
Subscribe
Share
likes
6 Views
7 months ago
Recently Updated Pages
Assertion The resistivity of a semiconductor increases class 13 physics CBSE
The Equation xxx + 2 is Satisfied when x is Equal to Class 10 Maths
How do you arrange NH4 + BF3 H2O C2H2 in increasing class 11 chemistry CBSE
Is H mCT and q mCT the same thing If so which is more class 11 chemistry CBSE
What are the possible quantum number for the last outermost class 11 chemistry CBSE
Is C2 paramagnetic or diamagnetic class 11 chemistry CBSE
Trending doubts
Difference Between Plant Cell and Animal Cell
Difference between Prokaryotic cell and Eukaryotic class 11 biology CBSE
Fill the blanks with the suitable prepositions 1 The class 9 english CBSE
Change the following sentences into negative and interrogative class 10 english CBSE
Summary of the poem Where the Mind is Without Fear class 8 english CBSE
Give 10 examples for herbs , shrubs , climbers , creepers
Write an application to the principal requesting five class 10 english CBSE
What organs are located on the left side of your body class 11 biology CBSE
What is the z value for a 90 95 and 99 percent confidence class 11 maths CBSE