3. Factorial a) Define a function named factorial() with a parameter n. This function returns the product of all values from n to 1 inclusive. This is known as n! or n*n-1*n-2*n-3*n-4... until n...

Python

Extracted text: 3. Factorial a) Define a function named factorial() with a parameter n. This function returns the product of all values from n to 1 inclusive. This is known as n! or n*n-1*n-2*n-3*n-4... until n reaches 1. For example: 5! is 5*4*3*2*1 = 120 b) Define a main() function to do the following: 1) Request an integer value num from the console. 2) Call factorial() with num as an argument. c) Call main() function to initiate the tasks to be performed. Example Output Enter an integer value: 5 5! is 120