def variations_without_repetition(sample_size, selection_size):
assert (isinstance(
sample_size, int)), 'Method requires integer paramter for sample size'
assert (isinstance(
selection_size,
int)), 'Method requires integer paramter for selection size'
return factorial(sample_size) / factorial(sample_size - selection_size)
def combinations(sample_size, selection_size):
assert (isinstance(
sample_size, int)), 'Method requires integer paramter for sample size'
assert (isinstance(
selection_size,
int)), 'Method requires integer paramter for selection size'
return factorial(sample_size) / (factorial(sample_size - selection_size) *
factorial(selection_size))
def permutations(sample_size):
assert (isinstance(sample_size, int)), 'Method requires integer paramter'
return factorial(sample_size)
def test_factorial_one():
assert factorial(1) == 1
def test_factorial_zero():
assert factorial(0) == 1
def test_factorial_fourteen():
assert factorial(14) == 87178291200