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5 June, 21:22

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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  1. 5 June, 21:34
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    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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