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B是倒装,还原后是attributes the properties of the average member of the population to every member of the population,似乎这并不是推理的ERROR,因为结论说the vast majority of those who test positive,同整体的every member of the population没有什么关系,是特定人群。 C指出了一个推理谬误,因为如果整体人群中have used cocaine的人数很少的话,例如,就100个,而整体人数是100000000000,则被randomly chosen group的概率变得很低,也就无法推出the vast majority of those who test positive will be people who have used cocaine.
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