The first and last terms of a $G.P.$ are $a$ and $l$ respectively; $r$ being its common ratio; then the number of terms in this $G.P.$ is
- A$\frac{\log l - \log a}{\log r}$
- B$1 - \frac{\log l - \log a}{\log r}$
- C$\frac{\log a - \log l}{\log r}$
- D$1 + \frac{\log l - \log a}{\log r}$
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