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28 August, 02:24

The cars access code has four digits first digit cannot be zero and the last digit must be even

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  1. 28 August, 03:06
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    There's 9 choices for the first digit and 4 choices for the last digit. The number of choices for the 2nd and 3rd digits is 90 if 2 numbers are different. or 100 if duplicates are allowed.

    If duplicates are allowed the answer is 9 * 100 * 4 = 3600 possible numbers.
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