Peppa_Even_PigShiGeNiuBDePig

摘要： \(A^m_n=\frac{n!}{(n-m)!}\) \(C^m_n=\frac{n!}{m!(n-m)!}\) \(C^m_n=\frac{A^m_n}{A^m_m}=C^{n-m}_n\) \(C^m_{n+1}=C^m_n+C^{m-1}_n\) \(C^0_n+C^1_n+C^2_n+…… 阅读全文