public void TestNChooseR()
{
Assert.AreEqual(21, NewOrder.NChooseR(7, 2));
Assert.AreEqual(10, NewOrder.NChooseR(5, 3));
Assert.AreEqual(1, NewOrder.NChooseR(5, 5));
Assert.AreEqual(210, NewOrder.NChooseR(10, 4));
Assert.AreEqual(11440, NewOrder.NChooseR(16, 9));
}