数学排列组合及概率问题公式的请教小弟不明白两条公式的具体应用A(M,N)=P(M,N)=N(N-1).(N-M+1)像C(2,5)+C(3,5)+C(4,5)+C(5,5)=10+10+5+1=26括号里的数字由于没发像公式那样打,其实是C,数字第一个
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![数学排列组合及概率问题公式的请教小弟不明白两条公式的具体应用A(M,N)=P(M,N)=N(N-1).(N-M+1)像C(2,5)+C(3,5)+C(4,5)+C(5,5)=10+10+5+1=26括号里的数字由于没发像公式那样打,其实是C,数字第一个](/uploads/image/z/1077259-67-9.jpg?t=%E6%95%B0%E5%AD%A6%E6%8E%92%E5%88%97%E7%BB%84%E5%90%88%E5%8F%8A%E6%A6%82%E7%8E%87%E9%97%AE%E9%A2%98%E5%85%AC%E5%BC%8F%E7%9A%84%E8%AF%B7%E6%95%99%E5%B0%8F%E5%BC%9F%E4%B8%8D%E6%98%8E%E7%99%BD%E4%B8%A4%E6%9D%A1%E5%85%AC%E5%BC%8F%E7%9A%84%E5%85%B7%E4%BD%93%E5%BA%94%E7%94%A8A%28M%2CN%29%3DP%EF%BC%88M%2CN%EF%BC%89%3DN%28N-1%29.%28N-M%2B1%29%E5%83%8FC%282%2C5%29%2BC%283%2C5%29%2BC%EF%BC%884%2C5%EF%BC%89%2BC%EF%BC%885%2C5%EF%BC%89%3D10%2B10%2B5%2B1%3D26%E6%8B%AC%E5%8F%B7%E9%87%8C%E7%9A%84%E6%95%B0%E5%AD%97%E7%94%B1%E4%BA%8E%E6%B2%A1%E5%8F%91%E5%83%8F%E5%85%AC%E5%BC%8F%E9%82%A3%E6%A0%B7%E6%89%93%2C%E5%85%B6%E5%AE%9E%E6%98%AFC%2C%E6%95%B0%E5%AD%97%E7%AC%AC%E4%B8%80%E4%B8%AA)
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