Determine whether the sequence is geometric. If so, find the common ratio. 1. 2, 6, 18, 54,
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1. 2, 6, 18, 54, 162, . . .
2. 48, −24, 12, −6, . . .
3. 1/5, -3/5, 9/5, -27/5, . . . .
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