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3. Home work Page 7 4.Which of the following are finite or infinite set? 1) Infinite set 2) Finite set 3) Infinite set 4) Finite set

4. Home work Page 7 4.Which of the following are finite or infinite set? 5) Infinite set 6) infinite set

5. 5.Which of the following are empty sets? Page 7 Empty set Not Empty set

6. Numbers Index Example 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.

7. From numbers 0 to 8, list all the (a)natural numbers,(b)whole numbers, (c)even numbers,(d)odd numbers. Index (a)Natural numbers : 1, 2, 3, 4, 5, 6, 7, 8 ( 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

8. 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

9. Example A = {1,3,5,7} B = {3,1,7,5} Set A and B are equal A = B

10. Example A = { 2,4,6 } B = {4,6 } C = { 6,4,2 }

11. 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

12. Gsp – g2 การเท่ากัน Gsp – g2 การเท่ากัน Example D = {2,4,6} E = {x:x is a positive even lass than 10} E= {2,4,6,8 }

13. Home work Page 7 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 ” }

14. 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}

15. Home work Page 7 Which of the following represent a pair of equal

16. Home work Page 7 Which of the following represent a pair of equal 4) A= {1,2,3,4,5} B= {5,4,3,2,1}

17. Home work Page 8 Which of the following represent a pair of equal 5) C = {0,1,3,7} D = {x:x is a integer number lass than10}

18. Home work Page 8 Which of the following represent a pair of equal 6) E ={12,14,16,18} F ={14,16,12,18}

19. Home work Page 8 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}

20. Home work Page 8 Which of the following represent a pair of equal

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