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24. ํ™•๋ฅ ๋ณ€์ˆ˜ \( X \)๊ฐ€ ์ดํ•ญ๋ถ„ํฌ \( \mathrm{B}\left(n, \frac{1}{3}\right) \)์„ ๋”ฐ๋ฅด๊ณ  \( \mathrm{V}(2X) = 40 \)์ผ ๋•Œ, \( n \)์˜ ๊ฐ’์€? [3์ ]

\begin{itemize}
    \item[1] 30
    \item[2] 35
    \item[3] 40
    \item[4] 45
    \item[5] 50
\end{itemize}