Test: Geometric Series - Ambitious

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Question 1:   Which of the following are geometric series?
4,8,12...
4,8,16...
1 2 , 1 2 , 3 2 ...
3,6,10...
Question 2:   Which of the following are geometric series?
1 2 , 1 4 , 1 9 .
2,4,9...
1.5,1,0.5...
9,3,1...
Question 3:   Find a common ratio in the following geometric series: 5,15,45...
r=5
r= 1 3
r=3
r=3
Question 4:   Find the 14 th term in the following geometric series: 12,6,3...
a 14 0.00146
a 14 0.15
a 14 0.0172
a 14 0.0031
Question 5:   Find the sum of the first 5 terms in the following series: 3 1 2 ,7,14,...
S 5 =108.5
S 5 =102.5
S 5 =98
S 5 =98.5
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