1.

\left. \begin{array} { l } { \text { If } x = \operatorname { log } _ { 12 } 6 , y = \operatorname { log } _ { 18 } 12 \text { and } z = \operatorname { log } _ { 24 } 18 } \\ { \text { that } 1 + x y z = 2 y z } \end{array} \right.

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