Let \( a, b, c \) be three distinct positive numbers which are G.P....

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Let \( a, b, c \) be three distinct positive numbers which are G.P. If \( \log _{c} a, \log _{b} c, \log _{a} b \) are in A.P., then the common difference of the A.P. is
(a) \( 1 / 2 \)
(b) \( 3 / 2 \)
(c) \( 5 / 2 \)
(d) \( 7 / 2 \)
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