#include <iostream>
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
const int N=1e3;
int a[N+5],b[N+5];
int gcd(int a,int b)
{
    if(b==0) return a;
    gcd(b,a%b);
}
int main()
{
    int T,n;
    scanf("%d",&T);
    while(T--)
    {
        scanf("%d",&n);
        for(int i=0;i<n;i++) scanf("%d",&a[i]);
        for(int i=0;i<n;i++) scanf("%d",&b[i]);
        for(int i=n-1;i>=0;i--)
        {
            if(a[i]==0&&b[i]==0) continue;
            else if(a[i]!=0&&b[i]==0) {printf("1/0\n");break;}
            else if(a[i]==0&&b[i]!=0) {printf("0/1\n");break;}
            else
            {
                int m=gcd(a[i],b[i]);
                printf("%d/%d\n",a[i]/m,b[i]/m);
                break;
            }
        }
    }
    return 0;
}