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A door lock requires 3 different letters to be pressed in the correct order. A combination is to be made from the 3 letters ABC. How many different combinations can there be?

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WWFelina
There are n! ways to arrange n different elements

This means there are 3! or 6 different arrangements of any 3 elements.
In this case namely,

abc
acb
bac
bca
cab
cba

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