Question: What is the run - time of an algorithm that determines all permutations of a 4 digit gym locker to break the lock? The lock

What is the run-time of an algorithm that determines all permutations of a 4 digit gym locker to break the lock? The lock digits go from 0 to 9. Typically the default is 0000.
This is called a brute force attack. The intruder tries all the combinations possible to finally break the code.

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