Higher Study | Quantitative Aptitude | Progression

In an HP, the fourth term is two times the eighth term. The first term of the HP will be?
if three positive integers a, b, c are in G.P., then log a, log b, log c are in
If a, b and c are in GP, then log a, log b and log c are in:
The arithmetic mean between two numbers is A and their geometric mean is G. Then the numbers are
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