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Sorry,这道题还是不解: The table gives three factors to be considered when choosing an Internet service provider and the percent of the 1,200 respondents to a survey who cited that factor as important. If 30 percent of the respondents cited both “user-friendly” and “fast response time,” what is the maximum possible number of respondents who cited “bargain prices,” but neither “user-friendly” nor “fast response time?”
最后是选A 312,没错,我都算过了的
假设极端情况:如果 1200人中恰恰就30%的人选了both U and F,其他70%只选了B,这样不应该是不才应该是最多的么? 人数能有1200*70%。 如果思路错了拜托lz解释一下你的算法。 谢谢,祝2战告捷! |