3. Which of the following are geometric sequences?


 3, 6, 9, 12 ,15, 18 ... arithmetic sequence ... common difference = 3

 5, 10, 20, 40, 80, 160 ... geometric sequence ... common ratio = 2

 10, 5, 2.5, 1.25, 0.625, 0.3125 ... geometric sequence ... common ratio = ½

 1, 3, 9, 27, 81 ... geometric sequence ... common ratio = 3

3. of following geometric sequences?

check apply.
(points : 2)
3, 6, 9, 12 ,15, 18

5, 10, 20, 40, 80, 160

10, 5, 2.5, 1.25, 0.625, 0.3125

1, 3, 9, 27, 81


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