#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
const int maxn=1e6;
int t,n,x; 
int a[1050];
int b[1050];
int measure(int x, int y)
{    
    int z = y;
    while(x%y!=0)
    {
        z = x%y;
        x = y;
        y = z;    
    }
    return z;
}
int main() {
    scanf("%d",&t);
    while (t--){
        int max1,max2;
        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){
                    printf("0/1\n");
                    break;
                }else if (b[i]==0){
                    printf("1/0\n");
                    break;
                }else{
                    x=measure(a[i],b[i]);
                    printf("%d/%d\n",a[i]/x,b[i]/x);
                    break;
                }
            }
        }
    }
    return 0;
}