#include<bits/stdc++.h>
using namespace std;
int t,n,i,d;
int a[1010],b[1010];
main()
{
    cin>>t;
    while(t--)
    {
        cin>>n;
        for(i=0;i<n;i++)scanf("%d",a+i);
        for(i=0;i<n;i++)scanf("%d",b+i);
        for(i=n-1;(a[i]|b[i])==0;i--);
        if(a[i]==0)printf("0/1\n");
        else if(b[i]==0)printf("1/0\n");
        else d=__gcd(a[i],b[i]),printf("%d/%d\n",a[i]/d,b[i]/d);
    }
}