public void BinomialTest2()
{
int n = 6;
int k = 4;
double expected = 15;
double actual = Special.Binomial(n, k);
Assert.AreEqual(expected, actual);
n = 100;
k = 47;
expected = 8.441348728306404e+28;
actual = Special.Binomial(n, k);
Assert.AreEqual(expected, actual, 1e+16);
}