exam Maths Puzzle Numerical Ability

how can you conclude that, log a,log b, and log c, form an arithmetic sequence, when you are given that, a,b and c form a geometric sequence?

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exam Other Question
Use a graphic calculator to solve the equation. Round to two decimal places:
8 on power "x" =2.1

Thanks Are the following lines parallel, perpendicular, or neither?
L1 with equation x - 4y = 12
L2 with equation 4x + y = 4

(A) Perpendicular
(B) Neither
(C) Parallel