Uri 1289

#include <bits/stdc++.h>

using namespace std;

int main() {
    int t;
    cin >> t;
    while(t--){
        int n, k;
        double p;
        cin >> n >> p >> k;
        if(p == 1.000000){
            if(k == 1){
                cout << fixed << setprecision(4) << 1.0 << "\n";
            } else if(n > 1 && k > 1){
                cout << fixed << setprecision(4) << 0.0 << "\n";
            }
        }

        else{
            double tp = (p*pow(1-p, k-1))/(1-pow(1-p, n));
            cout << fixed << setprecision(4) << tp << "\n";

        }
    }

    return 0;
}