Câu hỏi 18Nếu $$ \begin{aligned} y={}&(\log_2 3)(\log_3 4)\cdots\\ &(\log_n[n+1])\cdots(\log_{31}32), \end{aligned} $$ thì$4\lt y\lt5$$y=5$$5\lt y\lt6$$y=6$$6\lt y\lt7$