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24 September, 16:48

A locker combination system uses three digits from 0 to 9. How many different three-digit combinations with no digit repeated are possible?

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  1. 24 September, 18:43
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    Step-by-step explanation:

    Given that a locker combination system uses three digits from 0 to 9.

    Repitition is not allowed.

    Three digits can start with 0 also.

    Here since order matters, permutation should be used.

    Hence 3 digits for lock without repitition from 10 digits can be done in 10P3 ways

    =10*9*8

    =720

    There are 720 different combinations
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