雷磁离子及使用方法:C2n-3(n-1)+Cn+1(2n-3)值的集合
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2n-3<=n-1
且n+1<=2n-3
2<=n<=4
n=2 C2n-3(n-1)+Cn+1(2n-3) =4
n=3 C2n-3(n-1)+Cn+1(2n-3)=7
n=4 C2n-3(n-1)+Cn+1(2n-3)=11
集合{4,7,11}
C2n-3(n-1)+Cn+1(2n-3)值的集合
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