Geometric Sequence Basic

1. 1. Which of the following is a geometric sequence?

• a. 1, 3, 5, 7, ...

• b. 6, 12, 24, 48, ...

2. 2. Which of the two geometric sequences has a common ratio of 2?

• a. 3, 6, 12, 24,...

• b. 81, 27, 9, 3,...

3. Which of the following shows a geometric sequence?

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• 

The figure illustrates how one infected person can affect others. Does the situation tells a geometric sequence?

• No

• Yes

5. This refers to the number being multiplied to the preceding terms of a geometric sequence in order to obtain the next term.

• a. common difference

• b. common ratio

6. 6. What is the next term of the geometric sequence 40, 20, 10, ___ ?

• a. 9

• b. 5

7. 7. What is the common ratio of the geometric sequence 1, 5, 25, 125,...?

• a. 5

• b. 1/25

8. What is the missing term in the geometric sequence?

9. 4, -8, 16, ___ ,64

• a. 32

• b. - 32

9. 9. What is the first term of geometric sequence below?

10. ____, 1/2, 1/4, 1/8, 1/16

• a. 1

• b. 2

10. 10. If the a₁= 2 and r = -3, what is the 3rd term of the sequence?

• a. 12

• b. 18