\[\boxed{\mathbf{761}\mathbf{.}}\]
\[1)\ 3^{\log_{3}18} = 18\]
\[2)\ 5^{\log_{5}16} = 16\]
\[3)\ 10^{\log_{10}2} = 2\]
\[4)\ \left( \frac{1}{4} \right)^{\log_{\frac{1}{4}}6} = 6\]