1.

If \[\mathbf{log2}=\mathbf{x},\,\,\mathbf{log3}=\mathbf{y}\] and \[\mathbf{log7}=\mathbf{z},\]then the value of \[\mathbf{log(8}\mathbf{.}\sqrt[\mathbf{3}]{\mathbf{21}}\mathbf{)}\]is:

A.  \[2x+\frac{2}{3}y-\frac{1}{3}z\]          
B.  \[2x+\frac{2}{3}y+\frac{1}{3}z\]
C.  \[2x-\frac{2}{3}y+\frac{1}{3}z\]          
D.  \[3x+\frac{1}{3}y+\frac{1}{3}z\]
Answer» E.


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