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) \[1+\frac{\log l-\log a}{\log r}\]
Correct Answer: D
Solution :
\[l=a{{r}^{n-1}}\]\[\Rightarrow \]\[a,\ b,\ c,\ d\]\[\Rightarrow \]\[b\].
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