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Railways Sample Paper RRB (Group D) Sample Test Paper-6

  • question_answer
    The average of the first 100 positive integers is

    A)  100                 

    B)  51

    C)  505                 

    D)  49.5

    Correct Answer: C

    Solution :

    [c]   \[1+2+3+.....+n=\frac{n\,\,(n+1)}{2}\] \[\therefore \]Average \[=\frac{n+1}{2}=\frac{100+1}{2}=50.5\]


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