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3.01 Sequences and their defining rules - calculator free

Worksheet
Sequences
1

For the following sequences, write down the indicated term:

a

The third term in the sequence: 2, - 4 , 6, - 8 , 16, \ldots

b

The fourth term in the sequence: 3, 3.5, 4, 4.5, 5, 5.5, \ldots

c

The fifth term in the sequence: 5, 4, 3, 2, 1, 0, - 1 , \ldots

d

T_3 in the sequence: 4, - 5 , 6, - 7 , 8, \ldots

e

T_4 in the sequence: 200, 20, 2, 0.2, 0.02, \ldots

f

T_5 in the sequence: 1, 2.5, 4, 5.5, 7, 8.5, \ldots

2

For the following sequences:

i

Describe the recurring pattern in words.

ii

Find the next number in the sequence.

a

- 1 , 1, 3, 5, 7, \ldots

b

64, 32, 16, 8, 4, 2, \ldots

c

2, - 4 , 6, - 8 , 10, - 12 , \ldots

3

Calculate:

a

T_2 + T_4 for the sequence: 3, 5 , 7, 9 , 10, \ldots

b

2 T_1 - T_5 for the sequence: 8, 5, 2, -1, -4, \ldots

c

- 2 \left(T_3 + T_4\right) for the sequence: -2, 4, -6, 8, -10, 12, \ldots

Recurrence relations
4

State whether the following are recurrence relations:

a
\dfrac{S_n}{n} = n + 1
b
R_n = \left( 3 R_{n - 1}\right)^{5} + R_{n - 2}
c
T_{n+1} = T_n + 9
d
V_n = 3 \left(n - 1\right)
5

Write the recursive rule from the following descriptions. Let t_n be the nth term.

a

To find the next term, add 5 to the previous term.

b

To find the next term, add the two previous terms.

c

To find the next term, multiply the previous term by negative 1 and then add 7.

d

To find the next term, subtract one and a half from the previous term.

e

To find the next term, subtract 6 from the previous term.

f

To find the next term, multiply the two previous terms.

g

To find the next term, multiply the previous term by negative 5 and then subtract3.

h

To find the next term, add three and a quarter to the previous term.

6

Using the following recursive rules, state the first 5 terms of the sequence in order:

a

t_{n+1} = 2 t_n, t_1 = 2

b

a_n = a_{n - 1} + 6, a_1 = - 8

c

b_n = - b_{n - 1} + 3, b_1 = 0

7

For the following recursive relations, find:

i

T_2

ii

T_3

iii

T_4

a

T_n = \left( - 1 \right)^{n + 1} T_{n - 1}, T_1 = 2

b

T_{n + 1} = \left( 2 T_n\right)^{n - 1}, T_1 = 3

Explicit rules
8

State whether the following are explicit relations:

a
b_n = b_{n - 1} b_{n - 2}
b
d_n = n^{2} + 3 n + 8
c
a_n = 8 a_{n - 1} + a_1
d
c_n = 3 n^{2}
9

Using the following explicit rules, state the first 5 terms of the sequence in order, starting with n = 1:

a

b_n = 5 n - 2

b

s_n = n^{2} + 6

c

t_n = 2 n^{2} + n - 3

10

Consider the sequence given in the table below:

a
Write the general rule for T_n in terms of n.
b

Use the general rule to find T_{10}

n1234...
T_n36912...
11

Consider the sequence given in the table below:

a
Write the general rule for T_n in terms of n.
b

Use the general rule to find T_{11}

n1234...
T_n1357...
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