#include <bits/stdc++.h>
using namespace std;


int n;
int a[int(1e6 + 5)], b[int(1e6 + 5)];

void work() {
    scanf("%d", &n);
    for (int i = 0; i < n; i++) {
        scanf("%d", a + i);
    }
    for (int i = 0; i < n; i++) {
        scanf("%d", b + i);
    }
    for (int i = n - 1; ~i; i--) {
        if (a[i] | b[i]) {
            int x = a[i], y = b[i];
            int g = __gcd(x, y);
            printf("%d/%d\n", x / g, y / g);
            return;
        }
    }
}

int main() {
    int T;
    cin >> T;
    while (T--) work();


}