[計量] 猴哥112 no.10
If 55 percent of a group of people have brown hair
and 80 percent of the same group do not have red hair,
what fration of those who do not have brown hair
have red hair?
答案是 4/9
已爬文,若問到重覆的很抱歉
不太了解題目中group的範圍
且也不清楚棕髮和紅髮是否有交集
不知道有沒有人看過這題
可以為我解惑一下
謝謝!
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