\left\{ \begin{array} { l } { a _ { 1 } q ^ { 2 } = 12 } \\ { a _ { 1 } q ^ { 3 } = 18 } \end{array} \right.
Solve for a_1, q
a_{1} = \frac{16}{3} = 5\frac{1}{3} \approx 5.333333333
q = \frac{3}{2} = 1\frac{1}{2} = 1.5
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