10056.cpp

#include<stdio.h>
#define maxn 1000
double P;

double Ind[maxn+2];
int C,Ith;

void Gen() {
	double p = 1 - P, t = 1;
	int i;
	Ind[0] = 1;
	for(i = 1; i <=C; i++) {
		t *= p;
		Ind[i] = t;
	}
}

void Cal() {
	double u, d;
	if( (P - 0)<1E-5) {
		printf("0.0000\n");
		return;
	}
/*	if(C == 1 && Ith == 1) {
		printf("1.0000\n");
		return;
	}*/
	d = 1 - (Ind[C]);
	u = P * Ind[Ith-1];
	printf("%.4lf\n",(u/d));
}
int main() {
	int ks;
	scanf("%d",&ks);
	while(ks--) {
		scanf("%d%lf%d",&C,&P,&Ith);
		Gen();
		Cal();
	}
	return 0;

}