A python code please

Combination Formula nCr=(nr)!r!n! where n is the number of things to CHOOSE from, and we CHOOSE r of them, with no repetitions, but order DOES NOT matter. Combination Formula Example: Out of 3 letter items, how many ways can we choose 2 letter items, with no repetition and order is important X=(n-r)!r!ynZ3C2=(32)!2!3!=1.213.7n=3 Problem: Create a function in Python that accepts given n number of things to choose from and the number of r that we choose from n. The function shall return and display the number of possible combinations