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標題:
Probability quest.
發問:
In a restaurant, if you buy a meal you can randomly get a coupon and there are totally 4 coupons. After you collect 4 different kinds of coupons, you can get a free meal. On average, how many meals do you expect to buy before you can get a free one? 更新: ...and there are totally 4 different kinds of coupons.
最佳解答:
=================================================== 圖片參考：http://img231.imageshack.us/img231/1669/62589498.png 2010-05-02 00:41:56 補充： http://img231.imageshack.us/img231/1669/62589498.png
其他解答:
這裏可以幫到你 http://actioni.w7.c361.net/yahoo.com.hk/hk/auction/178987536
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