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Worksheets

Recursive Formulas

Total questions: 13

Worksheet time: 53mins

Name
Class
Date
1.
Write the recursive formula for 6, 17, 28, 39, 50....
a)
an=an-1+11
a1=6
b)
an=an-1-4
a1=6
c)
an=an-1+9
a1=6
d)
an=an-1+6
a1=6
2.
Write a recursive rule for the sequence 17, 1, -15, -31 . . .
a)
an = an-1 + 16
a1=17
b)
an = an-1 - 17
a1=17
c)
an = an-1 - 15
a1=17
d)
an = an-1 - 16
a1=17
3.
Find the 4th term for the sequence defined by a1=9; an=an-1+8
a)
35
b)
17
c)
41
d)
33
4.

Write a recursive formula for the following sequence:

16,8, 4, 2,...

a)

a1=16

an=an-1 (2)

b)

a1=16

an=an-1 (1/2)

c)

a1=16

an=an-1 + (1/2)

d)

a1=16

an=an-1 + (2)

5.

Given the sequence: 125, 25, 5, ....

Write the recursive formula

a)

an = (1/5)an-1

b)

an = 5an-1

c)

an = an-1 + 1/5

d)

an = an-1 + 5

6.
Given the first five terms, write the recursive formula.
15, 12, 9, 6, 3 ....
a)
u1 = 15
un = un-1 + 3
b)
u0 = 15
un = un-1 + 3
c)
u1 = 15
un = un-1 - 3 
d)
u0 = 15
un = un-1 - 3
7.
Find the next three terms:
5, 8, 11, 14...
a)
16, 19, 22
b)
17, 19, 21
c)
17, 20, 23
d)
16, 18, 20 
8.
Write the recursive formula for the following sequence?
6, 4, 2, 0, . . .
a)
an = -2n + 8
b)
a=6, an = an - 1 - 2
c)
a1 = 6, an = an-1 + 2
d)
a1 = 6, an = an-1 - 2
9.
Given the recursive formula, find the first four terms:
an = an-1 + 5
a1 = -16
a)
-16, -21, -26, -31
b)
5, -11, -27, -43
c)
-16, -80, -500, -200
d)
-16, -11, -6, -1
10.
Write the recursive formula for 6, 17, 28, 39, 50....
a)
an=an-1+11
a1=6
b)
an=an-1-4
a1=6
c)
an=an-1+9
a1=6
d)
an=an-1+6
a1=6
11.

Given the sequence 4, 11, 18, 25...... what is a3 ?

a)

4

b)

11

c)

18

d)

25

12.

Determine the 3rd term of the sequence.

a1=5

an= 2an-1 - 1

a)

14

b)

13

c)

17

d)

16

13.
Given the recursive formula below, find the first five terms.  
u1 = 3
un = un-1 + 2
where n ≥ 2
a)
3, 5, 7, 9, 11
b)
5, 7, 9, 11, 13