private double binomialCoefficient(final int n,final int k){
  return Math.floor(0.5 + Math.exp(binomialCoefficientLn(n,k)));
}

private double binomialCoefficient ( final int n , final int k ) { return Math . floor ( 0.5 + Math . exp ( binomialCoefficientLn ( n , k ) ) ) ; }
computes the binomial coefficient .
