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24. ๋ ์ฌ๊ฑด \( A, B \) ์ ๋ํ์ฌ \[ \mathrm{P}(A|B) = P(A) = \frac{1}{2}, \quad \mathrm{P}(A \cap B) = \frac{1}{5} \] ์ผ ๋, \( \mathrm{P}(A \cup B) \) ์ ๊ฐ์? [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} |