course mth 151

5.23. true

5. true

6. false

9. false

10. true

12. it is not perfect

18. 30- 1,2,3,5,6,15,10 42 Abundant

20. 95- 1,5,19 25 Deficient

21. 12, 18, 20, 24

24. Perfect number: a natural number that equals the sum of its dividers

Abundant number: a natural number that is led than the sum of its dividers

Deficient number: a natural number that is greater than the sum of its dividers

25. when you add all the proper dividers for 1184 the sum is 1210. When you add all the proper dividers for 1210 the sum is 1184

27. 14 = 2 + 7

30. none

36. A = 81-1 = 80 B= 64-1 = 63

39. 27 = 27

40. 8 = 8

42. False it’s right for the first 4 terms, but the 5th term has 8 digits

45. one, not happy

60. n!= 120 n!-1 = 119 n! + 1 = 121 n! – 1 = prime = no n! + 1= prime = no

63. sometimes