#include <iostream>
using namespace std;
int main() {
    int t;
    cin >> t;
    while (t--) {
        int n;
        cin >> n;
        int a[100];

        for (int i = 0; i < n; ++i) {
            cin >> a[i];
        }

        if (a[0] != a[1]) {
            if (a[0] == a[2]) {
                cout << 2 << endl;
            } else {
                cout << 1 << endl;
            }
        } else {
            for (int i = 2; i < n; ++i) {
                if (a[i] != a[0]) {
                    cout << i + 1 << endl;
                    break;
                }
            }
        }
    }

    return 0;
}