#include<stdio.h>#include<math.h>double cal(double p, double q, int tot, int people){    if(p == 0) return 0;    int lost = people - 1;    double ans = 0, t = 1;    double bi = pow(q, tot);    for(int i=1; i<=lost; i++) t *= q;    t *= p;    ans = t / (1 - bi);    return ans;}int main(){    int test;    scanf("%d", &test);    while(test--) {        int num, k;        double g;        scanf("%d%lf%d", &num, &g, &k);        printf("%.4lf\n", cal(g, 1-g, num, k));    }    return 0;}