17. Which of the following is an example of infinite sequence?
A: 5 15, 25, 35
B. 1, 9, 17, 25
C. 3, 6, 9, 12,... 30
D. 2, 6, 18, 54,
18. The following are example of infinte sequence EXCEPT.
A. 5, 15, 25, 35,
B. 1, 9, 17.25
C. 3, 6, 9, 12, ...
D. 2, 6. 16. 54.
19. If three arithmetic means are inserted between -15 and 9, find the first of these arithmetic means.
A. 3
B. -3
C.-6
D-9
20. The first term of an arithmetic sequence is 28 while the 12th term is 105. What is the common difference of the sequence?
A. 7
B. 6
C.5
D.4​