#include <bits/stdc++.h>

using namespace std;

ifstream f("dezastru.in");
ofstream g("dezastru.out");

double s[28],sum,sanse=1;
int n,m,k,cate,sol[28];

void backt(int k)
{
    if(k==m+1)
    {
        sum+=sanse;
        cate++;
    }
    else
    {
           for(int i=sol[k]+1;i<=n-m+k;i++)
           {
               sol[k+1]=i;
               sanse*=s[i];
               backt(k+1);
               sanse/=s[i];
           }
    }

}

int main()
{
    f>>n>>m;
    for(int i=1;i<=n;i++)
        f>>s[i];
    backt(1);
    cout<<sum<<' '<<cate;
    g<<setprecision(6)<<sum/cate;
    return 0;
}