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Which of these sequences is a geometric sequence? 1, 2, 4, 7, 11, 16, 22, … 2, 4, 8, 14, 22, 38, … 3, 6, 9, 12, 15, 18, 21, … 3, 9, 27, 81, 343, 729, …
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a sequence is said to be geometric when you multiple or divide with a single common number
so the last one is since you are multiplying by 3
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