Which of the following are geometric sequences?
First option: 3, 6, 9, 12, 15, 18
Second option: 10, 5, 2.5, 1.25, 0.625, 0.3125
Third option: 1, 3, 9, 27, 81
Fourth option: 5, 10, 20, 40, 80, 160
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