Multiple Choice Questions on The average of 1 sup2 2 sup2 3 sup2 4 sup2 5 sup2 6 sup2 7 sup2 is ........ for Mathematics - All Exams Preparation

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Multiple Choice Questions

The average of 1 sup2 2 sup2 3 sup2 4 sup2 5 sup2 6 sup2 7 sup2 is ........

Quantitative Aptitude ( CCS) Average
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     The average of 1², 2², 3², 4², 5², 6², 7² is ?

    40

    Incorrect Answer

    30

    Incorrect Answer

    20

    Correct Answer

    10

    Incorrect Answer
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    Explanation:

     Sum of squares of 1st 'n' natural numbers = n(n+1)(2n+1)/6

    and the no of terms here are 'n'.

    So the Average = Sum/no. of terms  => (n+1)(2n+1)/6 

    After putting n = 7, we'll get the average as 20.

    By: Deepak Dawra
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