Time Complexity: Update the definition of a factorial (#28914)

* Update the definition of a factorial

* Update the definition of a factorial

javascript/computer_science/time_complexity.md

@@ -221,7 +221,7 @@ You want to avoid this if at all possible, otherwise you won't be processing muc
 
 #### O(N!) - Factorial complexity
 
-A factorial is the product of the sequence of *n* integers. The factorial of 4(4!) is 4 \* 3 \* 2 \* 1.
+The factorial of a number is the product of all numbers between 1 and that number. The factorial of 4(4!) is 4 \* 3 \* 2 \* 1.
 
 You will come across Factorial Complexity if you ever need to calculate permutations or combinations. If you have an array and have to work out all the combinations you can make from the array, that is a Factorial complexity. It's manageable for a small number of items, but the leap with each new item in a dataset can be huge.
 

ruby/computer_science/time_complexity.md

@@ -219,7 +219,7 @@ You want to avoid this if at all possible, otherwise you won't be processing muc
 
 #### O(N!) - factorial complexity
 
-A factorial is the product of the sequence of *n* integers. For example, the factorial of 4 (written as 4!) is 4 \* 3 \* 2 \* 1.
+The factorial of a number is the product of all numbers between 1 and that number. For example, the factorial of 4 (written as 4!) is 4 \* 3 \* 2 \* 1.
 
 You will come across Factorial Complexity if you ever need to calculate permutations or combinations. If you have an array and have to work out all the combinations you can make from the array, that is a Factorial complexity. It's manageable for a small number of items, but the leap with each new item in a dataset can be huge.