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24. ๋‘ ์‚ฌ๊ฑด \( A, B \) ์— ๋Œ€ํ•˜์—ฌ

\[
\mathrm{P}(A|B) = P(A) = \frac{1}{2}, \quad \mathrm{P}(A \cap B) = \frac{1}{5}
\]

์ผ ๋•Œ, \( \mathrm{P}(A \cup B) \) ์˜ ๊ฐ’์€? [3์ ]

\begin{itemize}
    \item[1] \( \frac{1}{2} \)
    \item[2] \( \frac{3}{5} \)
    \item[3] \( \frac{7}{10} \)
    \item[4] \( \frac{4}{5} \)
    \item[5] \( \frac{9}{10} \)
\end{itemize}