#include #include #include #include #include #include #include #define mem(a,b) memset(a,b,sizeof(a)) using namespace std; const int maxn=500; const int inf=0x7fffff; double A(double x) { double r=1; for(double i=1;i<=x;i++) r*=i; return r; } double C(double m,double n) { double r=1; for(double i=n-m+1;i<=n;i++) r*=i; for(double i=m;i>=1;i--) r/=i; return r; } int main() { int t,a; double n,m; scanf("%d",&t); while(t--) { scanf("%d%lf%lf",&a,&n,&m); double ans=0; if(m==1) ans+=A(n-1); else for(double i=1;i