#include<bits/stdc++.h>
using namespace std;
int T,n,a[1010],b[1010],f;
int gcd(int a,int b){
    if(!b) return a;
    return gcd(b,a%b);
}
int main(){
    cin>>T;
    while(T--){
        f=0;
        scanf("%d",&n);
        for(int i=1;i<=n;i++) scanf("%d",&a[i]);
        for(int i=1;i<=n;i++) scanf("%d",&b[i]);
        for(int i=n;i>=1;i--){
            if(!(a[i]+b[i])) continue;
            if(!a[i]&&b[i]){f=1;break;}
            if(a[i]&&!b[i]){f=2;break;}
            int s=gcd(a[i],b[i]);a[i]/=s,b[i]/=s;
            printf("%d/%d\n",a[i],b[i]);
            break;
        }
        if(f==1) printf("0/1\n");
        if(f==2) printf("1/0\n");
    }
    return 0;
}
/*
3
2
0 2
1 0
2
1 0
0 2
3
2 4 0
1 2 0
*/