To find the common ratio in a geometric sequence, you can divide any term by the previous term.
Let's check the ratio between the consecutive terms:
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From the first term (2) to the second term (12): \[ \text{Common Ratio} = \frac{12}{2} = 6 \]
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From the second term (12) to the third term (18): \[ \text{Common Ratio} = \frac{18}{12} = 1.5 \]
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From the third term (18) to the fourth term (132): \[ \text{Common Ratio} = \frac{132}{18} = 7.33 (approximately) \]
Since the common ratio is not consistent between the terms, this sequence does not form a geometric sequence.
Therefore, none of the provided responses (12, 1/2, 4, -1.5, and 14) are correct, as the common ratio is not constant.