115. The largest lower bound of the sequence $\left\{\dfrac{2n+1}{3n+1}\right\}$ is which of the following? (4) $1$ (3) $\dfrac{2}{4}$ (2) $\dfrac{5}{7}$ (1) $\dfrac{2}{3}$
\textbf{115.} The largest lower bound of the sequence $\left\{\dfrac{2n+1}{3n+1}\right\}$ is which of the following?
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(4) $1$ \hfill (3) $\dfrac{2}{4}$ \hfill (2) $\dfrac{5}{7}$ \hfill (1) $\dfrac{2}{3}$
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