Elementary combinatorics: Factorial and binomial coefficient
Factorial
You use \(5\) different digits from \(\{1,\ldots, 9\}\) and make a number with it.
For example, with \(2, 5, 6, 7, 9\) you can form the number \(97652\).
How many different numbers can you write down with the given \(5\) digits
| amount of numbers that can be written down = |
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