查看完整版本: [數學][高中六]概率
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A1154 發表於 2012-10-29 06:52 PM

[數學][高中六]概率

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Requiem1 發表於 2012-10-29 08:48 PM

a. 3/10 * 2/9 * 1/8 = 1/120
b. 7/10 * 3/9 * 2/8 * C3取1 ＝7/40
c. 7/10 * 6/9 * 3/8 * C3取2 =21/40
d. 7/10 * 6/9 * 5/8 = 7/ 24
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