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B2---3--2---範例2---袋中有2紅3黑4白球一次抽3球求至少兩黑球的機率

B2---3--3---範例4---袋中有三紅四白五黑球每次取一球不放回分別球求在第一次取到黑球的條件下三次都是黑球與三次顏色均異的機率機率

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取後放回跟取後不放回差在哪?一次看懂取球問題|#數學3乘3 |曉戴數學|高中機率

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![[高中][B2][2-3][取球][尹正數學]](https://i.ytimg.com/vi/RBgA8O7vSVk/mqdefault.jpg)
[高中][B2][2-3][取球][尹正數學]

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Last Updated: August 21, 2026
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