#include <cstdio>
#include <cstring>
#include <algorithm>
#include <iostream>
#include <ctime>
#include <cmath>
using namespace std;
int a[1020];
int b[1020];
int ans1, ans2;
int get_gcd(int x,int y){
    if(x < y)swap(x,y);
    while(x % y > 0){
        int k = x % y;
        x = y;
        y = k;
    }
    return y;
}
void get_ans(int x){
    if(a[x] == 0 && b[x] == 0){
        get_ans(x-1);
        return;
    }
    
    if(a[x] == 0){
        ans1 = 0;
        ans2 = 1;
        return;
    }else if(b[x] == 0){
        ans1 = 1;
        ans2 = 0;        
    }else{
        int y = get_gcd(a[x], b[x]);
        ans1 = a[x] / y;
        ans2 = b[x] / y;
    }
}
int main(){
    
    int T;
    scanf("%d",&T);
    for(int ii=1;ii<=T;++ii){
        int n;
        scanf("%d",&n);
        for(int i=1;i<=n;++i){
            scanf("%d",&a[i]);
        }
        for(int i=1;i<=n;++i){
            scanf("%d",&b[i]);
        }
        
        get_ans(n);
        printf("%d/%d\n",ans1, ans2);
    }
    return 0;
}