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Question
$$\frac{1}{{{{\log }_a}b}} \times \frac{1}{{{{\log }_b}c}} \times \frac{1}{{{{\log }_c}a}}$$     is equal to -
Options:
A .  a + b + c
B .  abc
C .  0
D .  1
Answer: Option D
$$\eqalign{
& {\text{Given}}\,\,\,{\text{Expression}} \cr
& \left( {\frac{{\log a}}{{\log b}} \times \frac{{\log b}}{{\log c}} \times \frac{{\log c}}{{\log a}}} \right) \cr
& = 1 \cr} $$

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