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一、错把分步当分类例1小吃店的老板将外表不能分辨的6个芝麻汤圆与4个花生汤圆煮在一起.现在要给排好队的两个人各加1个汤圆,那么第一个人恰好加的是芝麻汤圆,第二个人恰好加的是花生汤圆的概率是____.错解第一个人加的是芝麻汤圆的可能结果有C_6~1个,第二个人加的是花生汤圆的可能结果有C_4~1个,所以第一个人恰好加的是芝麻汤圆,第二个人恰好加的是花生汤圆的可能结果有C_6~1·C_4~1个,则所求的概率为P=(C_6~1·C_4~1)/C_(10)~2=8/(15).
First, the wrong step When the classification of a snack bar owner will be able to distinguish the appearance of the six sesame dumplings with four peanut dumplings boiled together now to give a good team two people each add a dumpling, then the first Personally just add the sesame dumpling, the second person just added the probability of peanut dumpling is ____. The wrong person to add the sesame dumpling may result in C_6 ~ 1, the second plus Peanut dumpling may result in C_4 ~ 1, so the first person just added sesame dumpling, the second person just added the peanut dumpling may result in C_6 ~ 1 · C_4 ~ 1, then the probability of seeking P = (C_6 ~ 1 · C_4 ~ 1) / C_ (10) ~ 2 = 8 / (15).