Polynomials related Questions by Balaji

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    BalajiSenior Member
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    08-08-2014, 11:26 PM Düzenlendi #4
    what is the sum of 1^2+3^2+5^2+....31^2 ?



    a) 9455



    b) 5456



    c) 3468



    d) 4892





    answer choice b



    solution



    1^2+2^2+3^2......n^2 = (n(n+1)(2n+1))/6 



    expression = ((31*32*63)/6)-((60*16*31)/6)



    =5456


     

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    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