The sum of n terms of the series\begin{array}{l}{\log a+\log \frac{a^{2}}{b}+\log \frac{a^{3}}{b^{2}}+\ldots \text { is }} \\ {\text { (A) } n \log \left(\frac{a}{b}\right)} \\ {\text { (B) } n \log (a b)} \\ {\text { (C) } \frac{n^{2}}{2} \log \frac{a}{b}+\frac{n}{2} \log (a b)} \\ {\text { (D) } \frac{n^{2}}{2} \log \frac{a}{b}-\frac{n}{2} \log (a b)}\end{array}

The sum of n terms of the series\begin{array}{l}{\log a+\log \frac{a^{

1.	The sum of n terms of the series\begin{array}{l}{\log a+\log \frac{a^{2}}{b}+\log \frac{a^{3}}{b^{2}}+\ldots \text { is }} \\ {\text { (A) } n \log \left(\frac{a}{b}\right)} \\ {\text { (B) } n \log (a b)} \\ {\text { (C) } \frac{n^{2}}{2} \log \frac{a}{b}+\frac{n}{2} \log (a b)} \\ {\text { (D) } \frac{n^{2}}{2} \log \frac{a}{b}-\frac{n}{2} \log (a b)}\end{array}
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