问题描述:
求证:(1)A(n+1,n+1)-A(n,n)=n^2A(n-1,n-1); (2)C(m,n+1)=C(m-1,n)+C(m,n-1)+C(m-1,n-1)
求证:(1)A(n+1上标,n+1下标)-A(n上标,n下标)=n^2A(n-1上标,n-1下标)
(2)C(m上标,n+1下标)=C(m-1上标,n下标)+C(m上标,n-1下标)+C(m-1上标,n-1下标)
排列组合
求证:(1)A(n+1上标,n+1下标)-A(n上标,n下标)=n^2A(n-1上标,n-1下标)
(2)C(m上标,n+1下标)=C(m-1上标,n下标)+C(m上标,n-1下标)+C(m-1上标,n-1下标)
排列组合
问题解答:
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