5. Sum to infinity exist if ris_______________.
A. greater than 1 but less than -1.
B. greater than -1 but less than 1
C. more than -1 but greater than 1.
D. less than -1 but greater than 1.

6. If a1 = 1/4 and r = 4, find the fourth term of the sequence.
A. 1 B. 4 C. 16 D. 64

7. What is the 8th term of the Geometric sequence 10, 20, 40...?
A. 1280 B. 640 C. 320 D. 160

8. What is the sum of the first 7 terms of the sequence 9, 27, 81, ...?
A. 3789 B. 7389 C. 8937 D. 9837

9. What is a, if an = 5 and r = 1/2?
A. 625 B. 125 C. 25 D. 10

10. What is the geometric mean between 9 and 144?
A. 27 B. 36 C. 81 D. 105​