There are 1200 respondents to a poll, each favoring their preference for candidates A, B, and C. 54% ...
hedgeforfu 发表于 2010-3-24 07:31
当A∩B∩C=0时,只选C的人数最大。
A∪B=A+B-A∩B=54%+48%-30%=72%
那么 只选C的部分为1-72%=28%
具 ...
robert 发表于 2010-3-29 17:07
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