来自李爱中的问题
【6个数的排列组合怎么计算?公式是什么啊?有ABCDEF6个字母...任意取出X（X小于等于6）个字母,任意组合..这样的组合有多少种?】
6个数的排列组合怎么计算?公式是什么啊?
有ABCDEF6个字母...任意取出X（X小于等于6）个字母,任意组合..这样的组合有多少种?
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2020-02-07 01:20
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韩文令
有C（6,X）种表示从6个不同物体中选出X个的方法组合数6是C下标X是上标
高中学过就应该知道如何计算
2020-02-07 01:25:03
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