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$n=2^m q,(2,q)=1$ 结果好像是$(C_{2n}^1,C_{2n}^3,C_{2n}^5,\dots,C_{2n}^{2n-1})=2^{m+1}$ $C_{2n}^1=2 ... tommywong 发表于 2017-10-7 21:37
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