#include<bits/stdc++.h>
#define mp make_pair
#define fi first
#define se second
#define debug(x) cerr<<#x<<" = "<<(x)<<endl
#define eps 1e-8
#define pi acos(-1.0)
using namespace std;
void test(){cerr<<"\n";}
template<typename T,typename... Args>void test(T x,Args... args){cerr<<x<<" ";test(args...);}
typedef long long ll;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;
const int MAXN=(int)1e5+5;
const int MOD=(int)1e9+7;
int a[MAXN];
int b[MAXN];
int main()
{
    ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
    int t;
    cin>>t;
    while(t--){
        int n;
        cin>>n;
        for(int i=1;i<=n;i++){
            cin>>a[i];
        }
        for(int i=1;i<=n;i++){
            cin>>b[i];
        }
        int i=n;
        while(a[i]==0&&b[i]==0)i--;
        int g=__gcd(a[i],b[i]);
        cout<<a[i]/g<<"/"<<b[i]/g<<"\n";

    }
    return 0;
}