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     EduGorilla 
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    ab and cd are two  two-digit natural numbers. Given that 4b + a = 13k1 and 5d – c  = 17k2, where k1 and k2 are natural numbers. Find the largest number that will always divide the product of ab and cd.

    Options :-

    1. 144
    2. 169
    3. 221
    4. 256
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Reply To: ab and cd are two  two-digit natural numbers. Given that 4b + a = 13k1 and 5d – c  = 17k2,….
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