Using the factorial function on the TI-84 Plus CE graphing calculator can be useful when calculating permutations or other such statistical calculations. Students usually learn about factorials in introductory algebra courses for their use in probability, but will often forget what they are, as they aren’t used a whole lot until later courses. Here is a quick review on factorials:

Factorials are represented by an exclamation mark (!), and are typically placed after integers. A factorial indicates that you must find the product of that integer with all of the positive integers below it. For example, four factorial would be written as “4!”, and would be calculated as 4! = 4*3*2*1 = 24.

Ready to do this on your calculator? Let’s get started!

**Calculating the Factorial**

Start by typing the number you would like to find the factorial of.

To enter the factorial symbol (!), press **[math]**, press the **right arrow key 3 times** to get to the “PROB” tab, **scroll down to the fourth option** (the factorial symbol) and press **enter**.

Now, just press enter to evaluate the factorial!

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