C(n+1,n)*C(n,n-2)C上标N+1下标N乘C上标N下标N-2 是C(n,n+1)*C(n-2,n) C上标N下标N+1乘C上标N-2下标N

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C(n+1,n)*C(n,n-2)C上标N+1下标N乘C上标N下标N-2是C(n,n+1)*C(n-2,n)C上标N下标N+1乘C上标N-2下标NC(n+1,n)*C(n,n-2)C上标N+1下标N乘

C(n+1,n)*C(n,n-2)C上标N+1下标N乘C上标N下标N-2 是C(n,n+1)*C(n-2,n) C上标N下标N+1乘C上标N-2下标N
C(n+1,n)*C(n,n-2)C上标N+1下标N乘C上标N下标N-2
是C(n,n+1)*C(n-2,n) C上标N下标N+1乘C上标N-2下标N

C(n+1,n)*C(n,n-2)C上标N+1下标N乘C上标N下标N-2 是C(n,n+1)*C(n-2,n) C上标N下标N+1乘C上标N-2下标N
C(n+1,n)*C(n,n-2)
=C(n+1,1)*C(n,2)
=(n+1)*n*(n-1)/2
=(n^2-1)n/2
=(n^3-n)/2