#include<bits/stdc++.h>
using namespace std;
int a[1001],b[1001];
int gcd(int a,int b){
    return b==0?a:gcd(b,a%b);
}
int main(){
    int t;
    scanf("%d",&t);
    while(t--){
        int n;
        memset(a,0,sizeof(a));
        memset(b,0,sizeof(b));
        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]);
        for(int i=n;i>=1;i--){
            if(a[i]&&b[i]==0){
                printf("1/0\n");
                break;
            }
            if(a[i]==0&&b[i]){
                printf("0/1\n");
                break;
            }
            if(a[i]&&b[i]){
                int t=gcd(a[i],b[i]);
                printf("%d/%d\n",a[i]/t,b[i]/t);
                break;
            }
        }
    }
    return 0;
}