If a, b and c are in G.P., prove that:
log a, log b and log c are in A.P.
Find the 9th term of the series :1, 4, 16, 64, ..........................
The fifth term of a G.P. is 81 and its second term is 24. find the geometric progression.
Fourth and seventh terms of a G.P. are `1/18` and `-1/486` respectively. Find the G.P.
If the first and the third terms of a G.P. are 2 and 8 respectively. find its second term.
Find the seventh term from the end of the series :`sqrt2, 2, 2sqrt2,.......,32.`
For the G.P. `1/27, 1/9, 1/3,......81`; find the product of fourth term from the beginning and the fourth term from the end.