Let $\mathrm{a}, \mathrm{b}$ and c be the $7^{\text {th }}, 11^{\text {th }}$ and $13^{\text {th }}$ terms respectively of a non-constant A.P. If these are also the three consecutive terms of a G.P., then $\frac{\mathrm{a}}{\mathrm{c}}$ is equal to
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