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[See also Times Tables Cheat Sheet]

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What is a Factorial?The factorial of a number is the product of all positive integers from 1 up to that number. It's represented by an exclamation mark (!) after the number. Example with a Small NumberLet's say you want to find the factorial of 4, written as 4!
Important Points to Remember
Why is Factorial Important?Factorials are used in many areas of mathematics, including combinatorics, algebra, and calculus. They are especially useful in counting problems, like finding out how many ways you can arrange a set of objects. For example, imagine you have 3 different colored balls. The factorial helps you figure out how many different ways you can arrange these balls. For 3 balls, the answer would be 3! = 3 × 2 × 1 = 6. So, there are 6 different ways to arrange them. More Math Cheat Sheets 

