What is the factorial of $20$ ?

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Solution

Determine the factorial of $20$ .
$n!$ represents the factorial $n$ .
Such that, $n! = n (n - 1) (n - 2) \dots \dots \dots (3) (2) (1)$
Calculate the factorial of $20$ :
$\begin{array}{rcl} 20! & = & 20 \times 19 \times 18 \times 17 \times 16 \times 15 \times 14 \times \dots \dots \times 3 \times 2 \times 1 \\ \Rightarrow & 20! = 2432902008176640000 \end{array}$
Hence, the required factorial is $20! = \begin{array}{l} 2432902008176640000 \end{array}$ .

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