Sequence and Series Practice

Which sequence is an arithmetic sequence?

• 3, 6, 2, 7, ...

• 3, 6, 12, 24, ...

• 3, 6, 10, 15, ...

• 3, 7, 11, 15, ...

Which kind of sequence has a common ratio?

• Arithmetic
• Geometric

Which kind of sequence has a common difference?

• Arithmetic
• Geometric

Identify the common difference.
97, 86, 75, 64, ...

• 8
• 11
• -11
• -8

What is the common ratio of the geometric sequence below?
5, 25, 125, 625...

• 25
• 20
• 5
• 4

What is the explicit rule for the geometric sequence: 11, 22, 44, 88...

• u_n = 2(11)^n-1
• u_n = 11(2)
• u_n = 11(2)^n-1

Write the explicit formula for the sequence.

216, 72, 24, 8, ...

What is the eleventh term of an arithmetic sequence in which a1 = 3 and d = 6?

• 63

• 39

• 69

• 36

• 44

• 43

• 49

• 149
• 11,200
• 5,600
• 140