1.

Simplify: \[\left[ \frac{1}{{{\log }_{xy}}(xyz)}+\frac{1}{{{\log }_{yz}}(xyz)}+\frac{1}{{{\log }_{zx}}(xyz)} \right]\]  

A.  1                                
B.  2
C.  3                                
D.  0
Answer» C.  3                                


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