#include<bits/stdc++.h>
using namespace std;
int a[1100];
int b[1100];
int gcd(int x, int y){
    return !y ? x : gcd(y, x % y);
}
int main(){
    int T;
    scanf("%d", &T);
    while(T--){
        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]);
        int f,g;
        bool ok = true;
        for(int i = n-1; i >= 0; --i){
            if(a[i] && b[i]){
                f = a[i];
                g = b[i];
                break;
            }
            else if(a[i]){
                f = 1;
                g = 0;
                break;
            }
            else if(b[i]){
                f = 0;
                g = 1;
                break;
            }
            else continue;
        }
        int gg = gcd(f, g);
        printf("%d/%d\n", f/gg, g/gg);
    }
    return 0;
}