1.

The value of \[\frac{\mathbf{1}}{\mathbf{1+lo}{{\mathbf{g}}_{\mathbf{ab}}}\mathbf{c}}\mathbf{+}\frac{\mathbf{1}}{\mathbf{1+lo}{{\mathbf{g}}_{\mathbf{ac}}}\mathbf{b}}\mathbf{+}\frac{\mathbf{1}}{\mathbf{1+lo}{{\mathbf{g}}_{\mathbf{bc}}}\mathbf{a}}\]equals

A.  2  
B.  0              
C.  1                                
D.  log abc
Answer» B.  0              


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