#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
ll  A[1005];
ll B[1005];
int main()
{
    int T;
    scanf("%d",&T);
    while(T--){
        int N;
        scanf("%d",&N);
        for(int i=0;i<N;i++){
            scanf("%lld",&A[i]);
        }
        for(int i=0;i<N;i++){
            scanf("%lld",&B[i]);
        }
        for(int i=N-1;i>=0;i--){
            if(A[i]&&B[i]){
                ll t=__gcd(A[i],B[i]);
                cout<<A[i]/t<<'/'<<B[i]/t<<'\n';
                break;
            }else if(A[i]){
                cout<<1<<'/'<<0<<'\n';
                break;
            }else if(B[i]){
               cout<<0<<'/'<<1<<'\n';
               break;
            }

        }
    }

}