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12 × ratio = -18

→ ratio = -18/12 = -3/2 = -1.5

Checking:

-18 × ratio = -18 × -3/2 = 27 as required

The common ratio is -3/2 (or -1.5)

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โˆ™ 2016-08-18 05:44:26
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Q: What is the common ratio in the sequence 12 -18 27?
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