#include<bits/stdc++.h>

using namespace std;
#define ll long long

const int N = 1005;
int T, n, f[N], g[N];
int main() {
    scanf("%d", &T);
    while(T--){
        scanf("%d", &n);
        for(int i=0; i<n; ++i) scanf("%d", f+i);
        for(int i=0; i<n; ++i) scanf("%d", g+i);
        for(int i=n; i--;)
            if(f[i])
                if(g[i]){
                        printf("%d/%d\n", f[i]/__gcd(f[i], g[i]), g[i]/__gcd(f[i], g[i]));
                        break;
                }
                else{
                    puts("1/0");
                    break;
                }
            else if(g[i]){
                puts("0/1");
                break;
            }
    }
    return 0;
}