2010010306

Which of following statements about the sequence ${\left(\frac{n-2}{n+1}\right)}_{n=1}^{\mathrm{\infty }}$ is true? $$$$ (Help: A sequence is bounded below if all its terms are greater than or equal to a real number $L$, which is called the lower bound of the sequence. Similarly, a sequence is bounded above if all its terms are less than or equal to a real number $U$, which is called the upper bound of the sequence.)