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一個想很久的機率學問題

Jan 12th 2014, 19:37

相信以前很多人都玩過10塊錢抽一次的柑仔店中獎紅包
最近回想以前突然想到
假設

(1)剩下五包大獎還在同一個人一包一包抽抽三次
機率會是1/5+1/4+1/3 = 47/60嗎?

(2)上一輪抽完後老闆開了新一盒 50包同一個人十包十包抽抽三次
機率還會是10/50+10/40+10/30 = 47/60 嗎?

(3)剩下四十包同一個人先抽二十包後再抽十包抽兩次
機率會等於20/40+10/20 = 100%!?

以上假設都是中間沒別人抽

最後一題對機率不熟的我是完全想不通阿

如果有跟我想得不同的麻煩提出正解&解釋感謝

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