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新教材在例题和习题中给出了下面两个组合公式: 公式1 kCnk=nCn-1k-1. 公式2 Cmm=n-m/m+1Cnm+1. 这两个公式结构独特,在解题中有很多应用,请看以下几例: 例1 求和
The new textbook gives the following two combination formulae in the example questions and exercises: Formula 1 kCnk=nCn-1k-1. Formula 2 Cmm=nm/m+1Cnm+1. These two formulas are unique in structure and have problems in solving problems. For many applications, see the following examples: Example 1 Sum