We can do this by dividing the second term by the first term, or the third term by the second term, and so on. In this case, we have:
$$r = \frac{3}{2} = \frac{9/2}{3} = \frac{27/4}{9/2} = \frac{3}{2}$$
So, the common ratio (r) is $\frac{3}{2}$.
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