7#
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小 發表於 2011-6-4 09:50 PM (第 4704 天)
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☉☉☉☉probability problem ,help me !
1. how many different ways can 3boys and 3 girls be arranged in a row if boys and girls are arranged alternatively?
2. 4 boys and 5 girls are to be seated in a row. In how many ways can this be done if the girls and boys must be seated alternatively?
麻煩比我答案之餘,比個詳細的解析我 。。。
概率好難....
打救我