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fix typo
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BlueHorn07 committed Dec 27, 2024
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Expand Up @@ -78,9 +78,7 @@ categories: ["Probability"]

μ°Έκ°€μžκ°€ κ³ λ₯Έ 문을 $\textsf{A}$, λ‚˜λ¨Έμ§€ λ‘κ°œ 문을 $\textsf{B}$, $\textsf{C}$라고 ν•˜μž.

그리고 "λ¬Έ $\textsf{X}$에 μžλ™μ°¨κ°€ μžˆλŠ” 사건"을 $C_{\textsf{X}}$라고 ν•˜μž.

λ°˜λŒ€λ‘œ "λ¬Έ $\textsf{Y}$에 μ—Όμ†Œκ°€ μžˆλŠ” 사건"을 $G_{\textsf{Y}}$라고 ν•˜μž.
"λ¬Έ $\textsf{X}$에 μžλ™μ°¨κ°€ μžˆλŠ” 사건"을 $C_{\textsf{X}}$라고 ν•˜μž. 그리고 "μ°Έκ°€μžκ°€ λ¬Έ $\textsf{A}$λ₯Ό 지λͺ©ν•œ μƒνƒœμ—μ„œ μ‚¬νšŒμžκ°€ λ¬Έ $\textsf{Y}$에 μ—Όμ†Œκ°€ μžˆμŒμ„ λ³΄μ—¬μ£ΌλŠ” 사건"을 $G_{\textsf{Y}}$라고 ν•˜μž.

μš°λ¦¬κ°€ κ΅¬ν•˜κ³ μž ν•˜λŠ” 것은 사건 $G_{\textsf{Y}}$κ°€ μΌμ–΄λ‚œ μƒνƒœμ—μ„œ, $\textsf{A}$문에 μžλ™μ°¨κ°€ μžˆλŠ” 사건 $C_{\textsf{A}}$의 쑰건뢀 ν™•λ₯ , 즉 $P(C_{\textsf{A}} \mid G_{\textsf{Y}})$이닀. μ‚¬νšŒμžμ˜ 곡개둜 μ—Όμ†Œκ°€ μžˆμŒμ„ ν™•μΈν•˜λŠ” 문은 $\textsf{B}$ μ•„λ‹˜ $\textsf{C}$ 이닀. λ…Όμ˜μ˜ 편의λ₯Ό μœ„ν•΄ $G_{\textsf{B}}$κ°€ 일어났닀고 κ°€μ •ν•˜μž.

Expand Down Expand Up @@ -111,7 +109,7 @@ P(C_{\textsf{A}} \mid G_{\textsf{B}}) = \frac{P(G_{\textsf{B}} \mid C_{\textsf{A
$$

$$
P(C_{\textsf{C}} \mid G_{\textsf{B}}) = \frac{P(G_{\textsf{B}} \mid C_{\textsf{B}}B)}{P(G_{\textsf{B}} \mid C_{\textsf{A}}) + P(G_{\textsf{B}} \mid C_{\textsf{B}}) + P(G_{\textsf{B}} \mid C_{\textsf{C}})} = \frac{1}{0.5 + 1 + 0} = \frac{2}{3}
P(C_{\textsf{C}} \mid G_{\textsf{B}}) = \frac{P(G_{\textsf{B}} \mid C_{\textsf{B}})}{P(G_{\textsf{B}} \mid C_{\textsf{A}}) + P(G_{\textsf{B}} \mid C_{\textsf{B}}) + P(G_{\textsf{B}} \mid C_{\textsf{C}})} = \frac{1}{0.5 + 1 + 0} = \frac{2}{3}
$$

$P(C_{\textsf{C}} \mid G_{\textsf{B}})$의 ν™•λ₯ μ΄ 더 λ†’λ‹€λŠ” 것은, λ¬Έ $\textsf{B}$μ—μ„œ μ—Όμ†Œλ₯Ό λ΄€λ‹€λ©΄, 처음 μ„ νƒν•œ λ¬Έ $\textsf{A}$κ°€ μ•„λ‹Œ λ‹€λ₯Έ λ¬Έ $\textsf{C}$에 μžλ™μ°¨κ°€ μžˆμ„ ν™•λ₯ μ΄ ν¬λ‹€λŠ” 것이닀!
Expand All @@ -122,4 +120,6 @@ $P(C_{\textsf{C}} \mid G_{\textsf{B}})$의 ν™•λ₯ μ΄ 더 λ†’λ‹€λŠ” 것은, λ¬Έ $

# μ—¬λ‹΄

μˆ˜μ—…μ—μ„œ 이 문제λ₯Ό λ³Έ 후에, "21"λΌλŠ” μ΄λ¦„μ˜ λΈ”λž™μž­ κ²Œμž„μ— λŒ€ν•œ 카지노 μ˜ν™”μ—μ„œ 이 문제λ₯Ό ν•œλ²ˆλ” λ§Œλ‚¬λ‹€. μ˜ν™”μ—μ„œλŠ” κΉŠμ€ μ„€λͺ… 없이 잠깐 λ“±μž₯ν•œλ‹€.
μˆ˜μ—…μ—μ„œ 이 문제λ₯Ό λ³Έ 후에, "21"λΌλŠ” μ΄λ¦„μ˜ λΈ”λž™μž­ κ²Œμž„μ— λŒ€ν•œ 카지노 μ˜ν™”μ—μ„œ 이 문제λ₯Ό ν•œλ²ˆλ” λ§Œλ‚¬λ‹€. μ˜ν™”μ—μ„œλŠ” κΉŠμ€ μ„€λͺ… 없이 잠깐 λ“±μž₯ν•œλ‹€. κ·Έλž˜λ„ λ‚˜λ¦„ λ°˜κ°€μ› λ‹¬κΉŒ γ…‹γ…‹


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