\textbf{148-} Three people are working on decoding a message. Their probabilities of success are $\frac{2}{3}$, $\frac{3}{4}$, and $\frac{1}{2}$ respectively. What is the probability that at least one of them succeeds?
\medskip
(1) $\dfrac{19}{24}$ \hfill (2) $\dfrac{5}{6}$ \hfill (3) $\dfrac{11}{12}$ \hfill (4) $\dfrac{23}{24}$
\medskip