Question 21
If $$
\begin{gathered} \log_2(\log_3(\log_4x))=0,\\ \log_3(\log_4(\log_2y))=0,\\ \log_4(\log_2(\log_3z))=0, \end{gathered}
$$ then $x+y+z$ is equal to:
\begin{gathered} \log_2(\log_3(\log_4x))=0,\\ \log_3(\log_4(\log_2y))=0,\\ \log_4(\log_2(\log_3z))=0, \end{gathered}
$$ then $x+y+z$ is equal to: