Number Theory Related Questions by Balaji

  • 8August
  • 2014
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    BalajiSenior Member
    Senior Member
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    08-08-2014, 10:29 PM Düzenlendi #2
    The product of two non-coprime number is 1080. how many such pairs are possibles ?



    a) 16



    b) 4



    c) 12



    d) 15



    answer choice c

    solution


    a*b=1080
    no of factors =4*4*2=32

    no of ways of writing 1080 as a product of two non coprime no = 16-4=12
     

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    • Messages In This Thread
    Number theory related question phase - 2 - by Balaji - 08-08-2014, 10:29 PM