public override double Call(List <double> in_parameters)
{
if (in_parameters.Count != ParameterCount)
{
throw new Exception("Combination must have 2 parameter");
}
// Check for int
if (Math.Truncate(in_parameters[0]) != in_parameters[0] &&
Math.Truncate(in_parameters[1]) != in_parameters[1])
{
throw new Exception("Combination only accept integer paramaters");
}
return(Factorial.Do(in_parameters[0]) /
(Factorial.Do(in_parameters[1]) * Factorial.Do(in_parameters[0] - in_parameters[1])));
}