def test_n_choose_k_k_bigger_than_n(self): assert _n_choose_k(5, 10) == 0
def test_n_choose_k_big_k(self): assert _n_choose_k(10, 8) == 45
def test_n_choose_k_same(self): assert _n_choose_k(10, 10) == 1
def test_n_choose_k_small_k(self): assert _n_choose_k(10, 4) == 210