5. 1. find the pattern of a sequence.
2. identify the next term of a sequence.
3. differentiate between infinite and finite sequences.
4. give the value of sum of numbers in a sequence
5. value the importance of respect in a family and orderliness
in workplace.
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At the end of this course presentation, you will be able to:
15. Finite Sequence
a sequence that ends
{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}
+1 +1 +1 +1 +1 +1 +1 +1 +1
< A sequence that has a first term and
a last term >
limited domain
17. Infinite Sequence
when the sequence goes on forever
it is called an infinite sequence
{1, 2, 3, 4, 5, …} ellipsis
<There is another term, after each term of the
sequence>
infinite domain
20. General terms of
sequences
If a is a sequence, its general term or nth
term is its function value a(n) usually
denoted by an (read as “a sub n”)
21. In the sequence 0, 1, 3, 6, 10, 15,… we
can denote the terms as follows:
a₁ = 0
a₂ = 1
a₃ = 3
a₄ = 6
a₅ = 10
a₆ = 15
1st term 2nd term 3rd term 4th term 5th term
𝑎1 𝑎2 𝑎3 𝑎4 𝑎5
6th term 7th term 8th term 9th term 10th term
𝑎6 𝑎7 𝑎8 𝑎9 𝑎10
nth term
𝑎𝑛
22. Find the first four terms of the
sequence defined by
an = 2n + 1
first term
Replace n with 1, 2, 3, and 4 in the
expression of an
a₁ = 2(1) + 1
= 3
second term
a₂ = 2(2) + 1
= 5
third term
a₃ = 2(3) + 1
= 7
20th term
a₄ = 2(4) + 1
= 9
an = 2n + 1
= 3, 5, 7, 9
fourth term
A₂₀ = 2(20) +
1
= 41
23. an =
𝒏+𝟐
𝒏+𝟒
Find the first five terms
a₁ =
𝟑
𝟓
a₂ =
𝟐
𝟑
a₃ =
𝟓
𝟕
a₄ =
𝟑
𝟒
a₅ =
𝟕
𝟗
a₂₅=
𝟐𝟕
𝟐𝟗
a₃₇=
𝟑𝟗
𝟒𝟏
A₇₃=
𝟕𝟓
𝟕𝟕
24. Find the indicated term of each
sequence
1. an = 6n -
4 = 50
a₉
2. an = 1 -
𝟏
𝒏
=
𝟏𝟏
𝟏𝟐
a₁₂
3. an = (𝟒)𝒏−𝟑
( n +
2)
=
112
a₅
4. an = (−𝟐)𝒏−𝟓 =
256
a₁₃
5. an = 7n +
7 = 77
a₁₀
32. The general term of a sequence is
given. Write the first four terms, the
10th term, and the 15th term
1. an = 2n -1
= 1, 3, 5, 7 ;
19; 29
2. an = 3n +
2
= 5, 8, 11,
14; 32; 47
3. an = n² + 2= 3, 6, 11, 18;
102;227
4. an = n² - 3
= -2, 1, 6, 13;
92 ; 222
5. an =
𝒏
𝒏+𝟏
=
𝟏
𝟐
,
𝟐
𝟑
,
𝟑
𝟒
,
𝟒
𝟓
;
𝟏𝟎
𝟏𝟏
;
𝟏𝟓
𝟏𝟔
33. The general term of a sequence is
given. Write the first four terms, the
10th term, and the 15th term
6. an =
𝒏
𝒏+𝟒
=
𝟏
𝟓
,
𝟏
𝟑
,
𝟑
𝟕
,
𝟏
𝟐
;
𝟓
𝟕
;
𝟏𝟓
𝟏𝟗
7. an = 1 +
𝟏
𝒏
= 2 ,
𝟑
𝟐
,
𝟒
𝟑
,
𝟓
𝟒
;
𝟏𝟏
𝟏𝟎
;
𝟏𝟔
𝟏𝟓
34. The general term of a sequence is
given. Write the first four terms, the
10th term, and the 15th term
8. an = 1 -
𝟏
𝒏
=0,
𝟏
𝟐
,
𝟐
𝟑
,
𝟑
𝟒
;
𝟗
𝟏𝟎
;
𝟏𝟒
𝟏𝟓
9. an =
𝒏 −𝟏
𝒏+𝟐
= 0 ,
𝟏
𝟒
,
𝟐
𝟓
,
𝟏
𝟐
;
𝟑
𝟒
;
𝟏𝟒
𝟏𝟕
10. an =
𝒏+𝟐
𝒏+𝟑
=
𝟑
𝟒
,
𝟒
𝟓
,
𝟓
𝟔
,
𝟔
𝟕
;
𝟏𝟐
𝟏𝟑
;
𝟏𝟕
𝟏𝟖
35. Find the indicated term of each
sequence
1. an = 8n -
18
= 78
a₁₂
2. an = 2n + 5 =33
a₁₄
3. an = (−𝟐)𝒏−𝟐
(2n +
1)
=
208
a₆
4. an = (1 -
𝟏
𝒏
) =
𝟗
𝟏𝟎
a₁₀
41. Recursive Form
The general term is expressed by using the
previous term.
2, 5, 8, 11, 14
𝑎𝑛 = 𝑎𝑛−1 + 3
𝑎6−1 + 3
𝑎6 =
= 𝑎5 + 3 = 17
= 14 + 3
6th 𝑡𝑒𝑟𝑚
42. Recursive Form
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The general term is expressed by using the
previous term.
18, 14, 10, 6, 2, -2
𝑎𝑛 = 𝑎𝑛−1 − 4
43. Recursive Form
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The general term is expressed by using the
previous term.
1, 3, 9, 27, 81
𝑎𝑛 = 𝑎𝑛−1 𝑥3
𝑎𝑛 = 3(𝑎𝑛−1)
44. Find for the Recursive Form.
1, 3, 7, 15, 31, 63
𝑎𝑛 = 2(𝑎𝑛−1) + 1
multiply previous term
by 2 add 1
45. Recursive Form
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The general term is expressed by using the
previous term.
3, 7, 11, 15, 19
𝑎𝑛 = 𝑎𝑛−1 +4
47. Explicit Form
The general term is expressed by using the position
of the term in the sequence.
Express the sequence into another
formula.
2, 4, 6, 8, 10, …
Express it through a table first.
Term (𝒂𝒏) 2 4 6 8 10
Position (𝑛) 1
(1st)
2
(2nd)
3 4 5
48. Use the position in getting the formula of the general term.
Term (𝒂𝒏) 2 4 6 8 10
Position (𝑛) 1
(1st)
2
(2nd )
3
(3rd )
4
(4th)
5
(5th)
𝑎𝑛 = (𝑛)
2
Explicit Form
To get 2, multiply the first term (1) by 2
To get 4, multiply the second term (2) by 2
To get 6, multiply the third term (3) by 2
49. Explicit Form
3, 6, 9, 12, 15, 18
𝑎𝑛 = 3𝑛
Term (𝒂𝒏) 3 6 9 12 15
Position (𝑛) 1 2 3 4 5
50. Explicit Form
The general term is expressed by using the position
of the term in the sequence.
5, 10, 15, 20
𝑎𝑛 = 5𝑛
55. Find the Explicit Form.
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12, 16, 20, 24, 28, …
𝑎𝑛 = 4(𝑛 + 2)
56. Find a possible formula for the general terms
of the sequence
a. 1, 8, 27, 64, 125,… an = n³
b. 2, 4, 6, 8, 10, 12,… an = 2n
c. 1, 3, 5, 7, 9,11,… an = 2n - 1
59. What are the next three
numbers after the
sequence?
1, 1, 2, 3, 5, 8, …
13 21 34
+ + + + +
60. Leonardo
Pisano Bigollo
-born in Pisa, Italy
-a famous Italian Mathematician
of the Medieval Period
-famous for his work, Liber Abaci Leonardo Pisano Bigollo
61. Fibonacci
Pattern
-it is a pattern used in taking
photos in a great manner
Fibonacci Pattern
-uses a proper
concentration of the
foreground against the
background