public void TestNChooseK()
{
int n = 100;
int k = 50;
double d = MathX.NChooseK(n, k);
AssertEquals("NChooseK ", 1.00891344545564E29, d);
n = -1; k = 1;
d = MathX.NChooseK(n, k);
AssertEquals("NChooseK ", Double.NaN, d);
n = 1; k = -1;
d = MathX.NChooseK(n, k);
AssertEquals("NChooseK ", Double.NaN, d);
n = 0; k = 1;
d = MathX.NChooseK(n, k);
AssertEquals("NChooseK ", Double.NaN, d);
n = 1; k = 0;
d = MathX.NChooseK(n, k);
AssertEquals("NChooseK ", 1, d);
n = 10; k = 9;
d = MathX.NChooseK(n, k);
AssertEquals("NChooseK ", 10, d);
n = 10; k = 10;
d = MathX.NChooseK(n, k);
AssertEquals("NChooseK ", 1, d);
n = 10; k = 1;
d = MathX.NChooseK(n, k);
AssertEquals("NChooseK ", 10, d);
n = 1000; k = 1;
d = MathX.NChooseK(n, k);
AssertEquals("NChooseK ", 1000, d); // awesome ;)
n = 1000; k = 2;
d = MathX.NChooseK(n, k);
AssertEquals("NChooseK ", 499500, d); // awesome ;)
n = 13; k = 7;
d = MathX.NChooseK(n, k);
AssertEquals("NChooseK ", 1716, d);
}