1.

*$_$$\eqalign{ & {\text{The}}{\kern 1pt} {\text{value}}{\kern 1pt} {\text{of}} \cr & \left( {\frac{1}{{{{\log }_3}60}} + \frac{1}{{{{\log }_4}60}} + \frac{1}{{{{\log }_5}60}}} \right){\text{is}}: \cr} $$?

A. 0
B. 1
C. 5
D. 60
Answer» C. 5


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