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a four digit serial number
needs to be created using
digits 0-9. first digit is
even , no digit is repeated ,
last digit is odd

  • math-permutuation -

    First digit is even: 4 choices (assuming zero is excluded)
    Last digit is odd: 5 choices
    Eight digits remain for the second digit, and 7 for the third (no repetition).
    Total=product of all four numbers.

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