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There are 11 women and 9 men in a certain club. If the club is to select a committee of 2 women and 2 men, how many different such committees are possible?
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从11个里面选2个有11*10/2=55种选法，同理9选2有9*8/2=36种选法，二者组合有55*36种方法，所以为1980种组合方式
默默
因为是同时发生，最终用乘法
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2018-05-15 04:36:28
HansonCheng回复默默
你又出来了 同时发生？？ 我还去年发生呢 一件事没完成用乘法 完成用加法 谢谢你
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2019-06-19 13:35:26
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