设G(x)G(x)G(x)为一OGFOGFOGF 选出其子集大小为2的OGFOGFOGF是12G(x)2−12G(x2)\frac{1}{2}G(x)^2-\frac{1}{2}G(x^2)21G(x)2−21G(x2) 选出其子集大小为3的OGFOGFOGF是16G(x)3−12G(x2)G(x)+13G(x3)\frac{1}{6}G(x)^3-\frac{1}{2}G(x^2)G(x)+\frac{1}{3}G(x^3)61G(x)3−21G(x2)G(x)+31G(x3) 选出其子集大小为4的OGFOGFOGF是124G4(x)+8G(x3)G(x)+3G2(x2)−6G2(x)G(x2)−6G(x4)\frac{1}{24}G^4(x)+8G(x^3)G(x)+3G^2(x^2)-6G^2(x)G(x^2)-6G(x^4)241G4(x)+8G(x3)G(x)+3G2(x2)−6G2(x)G(x2)−6G(x4) 选出其子集大小为k的OGFOGFOGF是什么？
