1.

If \[{{a}^{x}}={{b}^{y}}={{c}^{z}}\] and \[{{b}^{2}}=ac\], then y equals

A.  \[\frac{2xz}{x+z}\]               
B.  \[\frac{xz}{2(x-z)}\]  
C.  \[\frac{xz}{2(z-x)}\]  
D.         \[\frac{2xz}{(x-z)}\]
Answer» B.  \[\frac{xz}{2(x-z)}\]  


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