Python code for calculate the factorial with the help of function and make the program compatible with R

please code in python 1).  Multiplication using Addition Write a function: mul(a,b) that will compute and return the product of two positive integers a and b using only a for loop and the addition operator ( + ).    Then, write a new function mul2(a,b) that does the same thing, but uses a while loop rather than a for loop.     2).  Exponentiation using Multiplication Write a function expo(x,y) that computes and returns the exponent xy using only a loop and the multiplication operator.   Then, adjust it so that rather than using the multiplication operator, it uses one of the multiplication functions you wrote in part 1.   Hints: xy is equal to (x * x * x * x ... x), y times. When you’re computing a sum using a loop, you start at 0, since anything + 0 is itself. When you’re computing a product using a loop, you start at ?, since anything * ? is itself (fill in the ?). If you wrote your mul function from part 1 correctly, then the following two lines should have the same effect, so you…

C++ Nothing too advanced please. Learning the basics #include <iostream>using namespace std;int main()

2- Write a python program that prompts the user to enter an integer and passes that integer as a parameter to a function to calculate the factorial of that number.

Note: It`s python code Implement the following code:1) Define a function prodTwo which returns the product of two input parameters, x and y.2) Call the prodTwo function with 4 and 5 as arguments.3) Print the result of the function call. Example Output (4 and 5 are arguments)20