6,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?? (33)
为什么我算出来是0.28
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