从hat中三种颜色,随便跳出一个,三种选法；从sweater其他二种颜色中,随便跳出一个,两种选法；最后,jean只有一种颜色可以选择了,一种选法.这是排列问题
3*2*1=6
Meredith has a red hat,a blue hat,and a white hat.She also h
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