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Math Help - Find all naturAls numbers. X , Y..

  1. #1
    Super Member dhiab's Avatar
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    Find all naturAls numbers. X , Y..

    A is in decimal representation :
    Find all naturAls numbers. X , Y.. so that A divide by 25 .
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  2. #2
    Super Member Gamma's Avatar
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    Maybe I am misunderstanding something, I don't know.

    so your number can be written:
    A=100\cdot xyxyxyxyx + y5
    where these are the decimal representation.

    25|100, so you need only worry about when 25|y5 which is clearly only 25 or 75.

    so y=\{2,7\}
    x=\{0,1,2,3,4,5,6,7,8,9\}
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  3. #3
    Super Member Gamma's Avatar
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    further reflection

    unless x and y can represent multiple digit numbers?
    Then y=\{n\in \mathbb{N}|n ends in a 2 or a 7}
    x=\mathbb{N}
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