[計量] 請問一題集合問題!
If 55 percent of a group of people have brown hair and 80 percent
of the same group do not have red hair, what fraction of those who
do not have brown hair have red hair?
答案給的是4/9
不知是小弟的數學太差了嗎?還是有什麼線索看不出來...
感覺還少給一個條件...像是交集或補集之類的!
麻煩高手幫忙解答一下!
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