//determined
#include <cmath>
#include <cstdio>
#include <cstring>
#include <complex>
#include <cassert>
#include <iostream>
#include <algorithm>
#define set0(x) memset(x,0,sizeof(x))
#define debug(x) cerr<<#x<<'='<<x<<endl
using namespace std;
typedef long long ll;
template<typename T> void read(T &x){
    x = 0;char ch = getchar();int f = 1;
    while(!isdigit(ch)){if(ch == '-')f*=-1;ch=getchar();};
    while(isdigit(ch)){x = x*10+ch-48;ch=getchar();}
    x*=f;
}
ll gcd(ll a,ll b){
    if(b == 0)return a;
    return gcd(b,a%b);
}
int T,n,a[1010],b[1010];
int main(){
    read(T);
    while(T--){
        read(n);
        for(int i=0;i<n;i++)read(a[i]);
        for(int i=0;i<n;i++)read(b[i]);
        for(int i=n-1;i>=0;i--){
            if(a[i]>0 || b[i]>0){
                int dd = gcd(a[i],b[i]);
                a[i]/=dd;
                b[i]/=dd;
                cout<<a[i]<<'/'<<b[i]<<endl;
                break;
            }
        }
    }
    return 0;
}