Thank you for the opportunity to help you with your question!

Factorials are very simple things. They're just products, indicated by an exclamation mark. For instance, "four factorial" is written as "4!" and means 1×2×3×4 = 24. In general, n! ("enn factorial") means the product of all the whole numbers from 1 to n; that is, n! = 1×2×3×...×n.

i will give you exemples to make you understand :

6! = 6*5*4*3*2*1 = 720

5! = 5*4*3*2*1 = 120

10! = 10*9*......3*2*1 = 3628800

if you don't understand please just ask

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GOod Luck

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