In Try This 4 you probably noticed that because n! represents the product of consecutive whole numbers, you can write a product in a variety of ways. For example, 10! can also be expressed as 10 x 9! or 10 x 9 x 8!.
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Most calculators will have a factorial key, and usually the largest calculation they can do is 69! Try inputting 69! in your calculator and then see what happens when you try to enter 70!.