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SSC Sample Paper SSC CHSL (10+2) Sample Test Paper-7

  • question_answer
    .The average of the first fifteen natural numbers which leave a remainder 1 when divided by 5 is

    A)  40                               

    B)  41

    C)  39                               

    D)  42

    Correct Answer: B

    Solution :

     Average of first n natural numbers \[=\frac{n+1}{2}\] \[\therefore \] Required number      \[=\frac{5(n+1)}{2}+1\] \[=\frac{5(15+1)}{2}+1=5\times 8+1=41\]  


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