#include<bits/stdc++.h>

using namespace std;
typedef long long ll;
typedef pair<int, int> pii;
#define pb push_back
#define sz(a) ((int)a.size())
#define mem(a, b) memset(a, b, sizeof a)
#define lson (rt << 1)
#define rson (rt << 1 | 1)
#define gmid (l + r >> 1)
#define lnum (mid - l + 1)
#define rnum (r - mid)
const int maxn = 1e5 + 5;
const int maxm = 1e6 + 5;
const int mod = 1e9 + 7;
const int inf = 0x3f3f3f3f;

int a[maxn], b[maxn];
int n;

int gcd(int a, int b){

    return b ? gcd(b, a % b) : a;
}

int main(){

//    ios::sync_with_stdio(0); cin.tie(0);
    int t; scanf("%d", &t);
    while(t--){

        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]);
        if(n == 1){

            int d = gcd(a[1], b[1]);
            printf("%d/%d\n", a[1] / d, b[1] / d);
        }
        else{

            for(int i = n; i >= 1; --i){

                if(!a[i] && !b[i]) continue;
                int d = gcd(a[i], b[i]);
                printf("%d/%d\n", a[i] / d, b[i] / d);
                break;
            }
        }
    }
    return 0;
}