Factorial

$x$ $x$ $x$ $x$ $x$ $x$ $x$ $x$ $x$

You use $3$ different digits from $\{1,\ldots, 9\}$ and make a number with it.
For example, with $1, 3, 4$ you can form the number $431$ .

How many different numbers can you write down with the given $3$ digits

amount of numbers that can be written down =

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