Discussion

Explanation:

Give, b2 = a × c

Taking log both sides.

⇒ log b2 = log (a × c)

⇒ 2log b = log a + log c

⇒ log b = (log a + log c)/2

∴ log a, log b and log c are in A.P.

Note: If numbers are in G.P. their logs will always be in A.P.

Hence, option (a).

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