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12 August, 15:21

How many different codes of 4 digits are possible if the first digit must be 3,4, or 5 and if the code may not end in 0?

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  1. 12 August, 15:41
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    3 options for first

    10 for 2nd and 3rd

    9 for last

    3*10*10*9=2700

    2700 ways
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