#include<stdio.h>
#include<cmath>
#include<algorithm>
#include<iostream>
using namespace std;


int a[1005];
int b[1005];
int main() {
    int T;
    scanf("%d", &T);
    for (int tt = 0; tt < T; ++tt) {
        int n;
        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;
            }
            if (a[i]==0) b[i]=1;
            else if (b[i]==0) a[i]=1;
            else {
                int gad = __gcd(a[i],b[i]);
                a[i] /= gad;
                b[i] /= gad;
            }
            printf("%d/%d\n",a[i], b[i]);
            break;
        }
    }
    return 0;
}