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factorial
All right! Now we’re cooking. Let’s try a factorial problem.
To calculate the factorial of a non-negative integer x, just multiply all the integers from 1 through x. For example:
factorial(4)would equal4 * 3 * 2 * 1, which is 24.factorial(1)would equal1.factorial(3)would equal3 * 2 * 1, which is 6.
Instructions
1.
Define a function factorial that takes an integer x as input.
Calculate and return the factorial of that number.