#include <bits/stdc++.h>

using namespace std;

const int MaxN = 1000100;

int f[MaxN],g[MaxN];

int main() {
    int T;
    int n;
    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-1;i>=0;i--){
            if(f[i] == g[i]) {
                if(f[i] == 0) {
                    continue;
                }
                else {
                    
                    printf("1/1\n");
                    break;
                }
            }
            else {
                if(f[i] == 0){
                    printf("0/1\n");
                    break;
                }
                else if(g[i] ==0) {
                    printf("1/0\n");
                    break;
                }
                else {
                    int G = __gcd(f[i],g[i]);
                    printf("%d/%d\n",f[i]/G,g[i]/G);
                    break;
                }
            }
        }
    }
    return 0;

}