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21 December, 12:43

A code has 6 digits. You can type in 0~9 for your code. How many different combinations of codes can you make if you can repeat digits? How many different combinations of codes can you make if you can not repeat digits?

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  1. 21 December, 13:35
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    Combinations

    10 choices per slot

    10^6=1000000

    1 million different ways if can repeat

    if cannot repeat

    10*9*8*7*6*5=151200 ways without repat
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