/// <summary>Randomly selects some of N elements without order and repetition.</summary>
/// <returns>boolean array of length <c>N</c>, for each item true if it is selected.</returns>
public static bool[] RandomCombination(int n)
{
bool[] ret = new bool[n];
for (int i = 0; i < ret.Length; i++)
{
ret[i] = _random.NextBoolean();
}
return(ret);
}
