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A, B, C, and D represent different digits. AACA, ADDD, BCDB, and BDAC represent four different four-digit pri

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  • 1 decade ago
    Favorite Answer

    Prime numbers, perhaps?

    Then all four must be odd, since no even number greater than 2 is prime. And none of them can be 5, because any number ending in 5 has 5 as a factor. So they are 1, 3, 7, 9.

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  • Dr D
    Lv 7
    1 decade ago

    The first answerer is right. In addition it turns out to be 1,3,7,9 in that order.

    ie A=1, B=3, C=7, D=9

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