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标题: 本年度最费时及易错题之17 [打印本页]

作者: datatest 时间: 2002-9-10 17:02 标题: 本年度最费时及易错题之17

17.There are 1200 respondants to a poll, each favoring their preference for
candidates A, B, and C. 54% favored A, 48% favored B, and 42% favored C, and
there is 30% favored both A and B. what’s the largest possible number of
respondants favoring C, but not C & b , nor C & A?? 28
可是我的答案是
1200=A+B+C-A&B-B&C-A&C+A&B&C
C-B&C-A&C+A&B&C=1200-A-B+A&B=336

作者: tongxun 时间: 2002-9-10 17:11

你的答案是对的。28是指28%。人数为1200*28%=336

作者: datatest 时间: 2002-9-10 17:15

谢谢！你的答复速度太快了

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