1.

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. \[1+\frac{\log l-\log a}{\log r}\]
Answer» E.


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