\[1)\ x_{n} = \frac{1}{n}\]
\[Ответ:\ \ x_{n} \rightarrow 0.\]
\[2)\ x_{n} = \frac{( - 1)^{n}}{n}\]
\[Ответ:\ \ x_{n} \rightarrow 0.\]
\[3)\ x_{n} = \frac{n + 1}{n}\]
\[Ответ:\ \ x_{n} \rightarrow 1.\]
\[4)\ x_{n} = \frac{n - 2}{n}\]
\[Ответ:\ \ x_{n} \rightarrow 1.\]