New Home Forums Math Olympiad - IOQM division algorithm

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  • #76348
    Navya Jain
    Participant

    <p>it is question number 21 of subjective of tomato book. for a natural number n,let an=n^2+20. If dn denotes the greatest common divisor of an and a(n+1) then show dn divides 81</p>

    #76419

    Solution

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