#include <iostream>
#include <iomanip>
#include <cmath>
using namespace std;
int main(){
ios::sync_with_stdio(0);
int t;
cin>>t;
while(t--){
int n,i;
double p,q;
cin>>n>>p>>i;
q=1-p;
if(p>0)
cout<<fixed<<setprecision(4)<<(p*pow(q,i-1))/(1-pow(q,n))<<endl;
else
cout<<"0.0000"<<endl;
}
}
#include <iomanip>
#include <cmath>
using namespace std;
int main(){
ios::sync_with_stdio(0);
int t;
cin>>t;
while(t--){
int n,i;
double p,q;
cin>>n>>p>>i;
q=1-p;
if(p>0)
cout<<fixed<<setprecision(4)<<(p*pow(q,i-1))/(1-pow(q,n))<<endl;
else
cout<<"0.0000"<<endl;
}
}
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