#include<stdio.h>
using namespace std;
inline int gcd(int a,int b){
    return b?gcd(b,a%b):a;
}
int f[1005],g[1005];
int main(){
    int t;
    scanf("%d",&t);
    while(t--){
        int n;
        scanf("%d",&n);
        for(int i=0;i<n;i++)scanf("%d",&f[i]);
        for(int i=0;i<n;i++)scanf("%d",&g[i]);
        for(int i=n-1;i>=0;i--){
            if(!f[i]&&!g[i])continue;
            else if(f[i]&&!g[i])printf("1/0\n");
            else if(!f[i]&&g[i])printf("0/1\n");
            else{
                int d=gcd(f[i],g[i]);
                printf("%d/%d\n",f[i]/d,g[i]/d);
            }
            break;
        }
    }
    return 0;
}