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23 October, 23:39

How many different id cards can be made if there are 5 digits on a card and no digit can be repeated?

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  1. 24 October, 02:19
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    if no numbers can repeat then you have

    1st digit = 10 numbers

    2nd digit = 9 numbers

    3rd digit = 8 numbers

    4th digit = 7 numbers

    5th digit = 6 numbers

    10 * 9 * 8 * 7 * 6 = 30,240 different combinations
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