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[請問] 一題簡單國中機率問題
Oct 18th 2013, 12:32, by ZOROCOOL

作者ZOROCOOL (DH)

看板ask

標題[請問] 一題簡單國中機率問題

時間Fri Oct 18 12:32:45 2013

抱歉在準備考試，太久沒接觸國中數學.. 頓時間忘記怎解，google也不確定收尋啥 Q: 有五顆藍球四顆黃球，一次拿兩顆，求拿到一藍一黃的機率是? 請問答案是20/36嗎@@? 分母C9取2，分子C5取1*C4取1這樣?? -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 220.143.11.55

推 kattte:5/9 * 4/8 ? 10/18 12:34

→ ZOROCOOL:不不不，你的算法是分兩次拿的，題目問是一次拿兩顆 10/18 12:36

→ kattte:你怎麼會算出20/36阿 10/18 12:36

→ KeyFSN:就是20/36沒錯 10/18 12:41

→ kattte:恩 20/36沒錯 10/18 12:42

→ ZOROCOOL:哦呵呵，感謝兩位 10/18 12:42

推 DKer:這高中才教~ 10/18 13:00

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