Calculating the Factorial of a Number In mathematics, the notation n! represents the factorial of the nonnegative integer n.
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# Calculating the Factorial of a Number<br/>In mathematics, the notation

n! represents the factorial of the nonnegative integer n. The factorial of n is the product of all the nonnegative integers from 1 up through n. For example:
7! = 1 x 2 x 3 x 4 x 5 x 6 x 7 = 5,040
and
4! = 1 x 2 x 3 x 4 = 24
Design a program, in Python, that asks the user to enter a nonnegative integer and then displays the factorial of that number.

# Program calcualte the factorial of a number.
number = int(input(&quot;Please enter a non-negative integer: &quot;))
factorial = 1
# check for valid input
if number &lt; 0:...

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