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A comment on Why you should use four different digits for keypad locks. Parent comment
4 presses out of 10 options, not allowing duplicates, and order is significant: 5,040 options.
It's less certainly, but not dramatically.
4 presses out of 10 options, not allowing duplicates, and order is not significant: 210. That, I would call a dramatic reduction.
In a typical 10 button number lock order is not important, and you can choose from 1 to 10 presses: 1024 options.
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4 presses out of 10 options, not allowing duplicates, and order is significant: 5,040 options.
It's less certainly, but not dramatically.
4 presses out of 10 options, not allowing duplicates, and order is not significant: 210. That, I would call a dramatic reduction.
In a typical 10 button number lock order is not important, and you can choose from 1 to 10 presses: 1024 options.