Polynomials related Questions by Balaji

  • 8August
  • 2014
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    BalajiSenior Member
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    08-08-2014, 10:18 PM Düzenlendi #1
    6+24+60+120+210+336+504+720 up to 10 terms is equal to ?

    a) 3680


    b) 4290


    c) 5720


    d) 6170





    answer choice b


    solution


    =n(n+1)(n+2)
    =m^3 - m


    where m = n+1


    sum of all = m(m+1)(m^2+m-2) 


    subs m=n+1
    then put n=10


    =(10*11*12*13)/4
    = 4290

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    Polynomials related Questions by Balaji - by Balaji - 08-08-2014, 10:18 PM
    Polynomials related question phase-2 - by Balaji - 08-08-2014, 11:15 PM
    Polynomials related question phase-3 - by Balaji - 08-08-2014, 11:21 PM
    Polynomials related question phase-4 - by Balaji - 08-08-2014, 11:26 PM
    Probability related question phase-1 - by Balaji - 08-08-2014, 11:47 PM
    Polynomials related question phase-8 - by Balaji - 08-08-2014, 11:56 PM