[計量] If 55 percent of people have brown ...
1. If 55 percent of a group of peopole 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???
A.1/4
B.4/11
C.4/9
D.5/9
E.4/5
題意不是很請清楚
請大大幫個忙解釋一下
ANS: C
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