can you write a python code for a function of combination and permutation

Certainly! Here's a Python code that includes functions for combination and permutation calculations:

import math

def combination(n, r):
    """
    Calculates the combination of n choose r.
    """
    return math.factorial(n) // (math.factorial(r) * math.factorial(n - r))

def permutation(n, r):
    """
    Calculates the permutation of n choose r.
    """
    return math.factorial(n) // math.factorial(n - r)

# Example usage
n = 5
r = 3

# Calculate combination
comb = combination(n, r)
print(f"Combination of {n} choose {r} = {comb}")

# Calculate permutation
perm = permutation(n, r)
print(f"Permutation of {n} choose {r} = {perm}")

In this code, the combination function calculates the combination of n choose r using the formula n! / (r! * (n-r)!), where n! represents the factorial of n. The permutation function calculates the permutation of n choose r using the formula n! / (n-r)!. The code then demonstrates the usage of these functions by calculating the combination and permutation for n=5 and r=3.