#include<iostream>#include<cstdio>#include<cstring>using namespace std;double p[20],a[520],b[520];int main(){ int T,n,k1,k2,k3,x,y,z,ks; scanf("%d",&T); while(T--) { scanf("%d%d%d%d%d%d%d",&n,&k1,&k2,&k3,&x,&y,&z); ks=k1+k2+k3; memset(p,0,sizeof(p)); double p0=1.0/(k1*k2*k3); for(int i=1;i<=k1;++i) { for(int j=1;j<=k2;++j) { for(int k=1;k<=k3;++k) { if(i==x&&j==y&&k==z) continue; p[i+j+k]+=p0; } } } memset(a,0,sizeof(a));memset(b,0,sizeof(b)); for(int i=n;i>=0;--i) { for(int k=3;k<=ks;++k) { a[i]+=p[k]*a[i+k]; b[i]+=p[k]*b[i+k]; } a[i]+=p0; b[i]+=1; } printf("%.15lfn",b[0]/(1-a[0])); } return 0;}
