求Sn=C(n,1)+2C(n,2)+...+nC(n,n)
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求Sn=C(n,1)+2C(n,2)+...+nC(n,n)
C(n,1)+2C(n,2)+...+nC(n,n) n是下标
C(n,1)+2C(n,2)+...+nC(n,n) n是下标
![求Sn=C(n,1)+2C(n,2)+...+nC(n,n)](/uploads/image/z/6863947-43-7.jpg?t=%E6%B1%82Sn%3DC%28n%2C1%29%2B2C%28n%2C2%29%2B...%2BnC%28n%2Cn%29)
一,n为奇数,Sn=nC(n,n)+(1+n-1)C(n,1)+(2+n-2)C(n,2)+…+nC(n,n-1/2)=n[C(n,0)+C(n,1)+…+C(n,n-1/2)=n*2de(n-1)次方 二,n为偶数,Sn也一样
求Sn=C(n,1)+2C(n,2)+...+nC(n,n)
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