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Stand SW 100
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Equal Sets
• We will chake the answer
Home work
Page 7
4.Which of the following are finite or infinite set?
1) Infinite set
2) Finite set
1
3){x : x  , n is natural number } 3) Infinite set
n
1
4){ x : x  , n is natural number less than 999}
n
4) Finite set
Home work
Page 7
4.Which of the following are finite or infinite set?
5) Infinite set
6) infinite set
5.Which of the following are empty sets?
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Empty set
Empty set
Not Empty set
Example
Numbers
1. Natural numbers are the numbers we used in
counting and they are 1, 2, 3, 4, 5, 6, ... .
2. The first five whole numbers are 0, 1, 2, 3 and 4.
3. The whole numbers 0, 2, 4, 6 and 8 are examples
of even numbers. They are divisible by the
number 2.
4. The whole numbers 1, 3, 5, 7, 9 are examples of
odd numbers. When these numbers are divided
by 2, there is always a remainder 1.
Index
From numbers 0 to 8, list all the
(a) natural numbers,
(b) whole numbers,
(c) even numbers,
(d) odd numbers.
(a) Natural
1, 2, 3, 4, 5, 6, 7, 8
numbers :
(b) Whole numbers : 0, 1, 2, 3, 4, 5, 6, 7, 8
(c) Even numbers : 0,2, 4, 6, 8
(d) Odd numbers : 1, 3, 5, 7
Index
Equal Set
Two sets are equal if they contain exactly the same element
If two set A and B are equasl, we write A = B
Therefore , every elements of A is an element of B
If set A is not equal to set B , we write A = B
Example
A = {1,3,5,7}
Set A and B are equal
B = {3,1,7,5}
A = B
Example
A = { 2,4,6 }
B = {4,6 }
C = { 6,4,2 }
A B
BC
Example
D = {Letters in the word ‘paper’ }
E = {Letters in the word ‘pear’}
D= {p,a,e,r }
E= {p,e,a,r }
Set D and E are equal
D = E
Example
D = {2,4,6}
E = {x:x is a positive even lass than 10}
E= {2,4,6,8 }
DE
Gsp – g2 การเท่ากัน
Home work
Which of the following represent a pair of equal
1) A = {letters in the word “กรรมกร” }
B = {letters in the word “มรรคา” }
C = {letters in the word “มกราคม” }
D = {letters in the word “รากไม้” }
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Home work
Page 7
Which of the following represent a pair of equal
2) E = (7,14,21,…,343}
F = (x:x = 7n , n is a natural number less than 50}
Home work
Page 7
Which of the following represent a pair of equal
1
3) A  {x : x  1  , n is a natural
n
1 2 3 4
B  {0, , , , ,...}
2 3 4 5
number}
Home work
Which of the following represent a pair of equal
4) A= {1,2,3,4,5}
B= {5,4,3,2,1}
Page 7
Home work
Which of the following represent a pair of equal
5) C = {0,1,3,7}
D = {x:x is a integer number lass than10}
Page 8
Home work
Which of the following represent a pair of equal
6) E ={12,14,16,18}
F ={14,16,12,18}
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Home work
Which of the following represent a pair of equal
7) K= {x:x is a even number less than 10}
L = {2,4,6,8}
Page 8
Home work
Page 8
Which of the following represent a pair of equal
8)M  {x : x is a Integer and x  36
2
N  {6}
Teacher Mr.Chaweng
Stand SW 100
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See you again next class