1 Factorial. In short, a factorial is a function that multiplies a number by every number below it till 1. For example, the factorial of 3 represents the multiplication of numbers 3, 2, 1, i. e. = 3 × 2 × 1 and is equal to 6. In this article, you will learn the mathematical definition of the factorial, its notation, formula, examples and so on in detail.

You will generally see factorials expressed with an exclamation mark after the number, like so: So let's take 1 and calculate the factorial. 31 rowsthe factorial is the product of all integers less than or equal to n but greater than or equal to 1. The factorial value of 0 is by definition equal to 1. For negative integers, factorials are not defined. The factorial can be seen as the result of multiplying a sequence of descending natural numbers (such as 3 × 2 × 1). !) says to multiply all whole numbers from our chosen number down to 1. = 4 × 3 × 2 × 1 = 24. = 7 × 6 × 5 × 4 × 3 × 2 × 1 = 5040.