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Railways Sample Paper RRB (Group D) Sample Test Paper-14

  • question_answer
    The numbers 1 to 29 are written side by side as follows 1234567891011............................ 28 29 If the number is divided by 9, then what is the remainder?"

    A)  3        

    B)  1

    C)  0                    

    D)  None of these

    Correct Answer: A

    Solution :

    [a] Sum of the digits of the 'super' number \[=1+2+3+............+29\] \[=\frac{29}{2}.\left\{ 2\times 1+(29-\,1).1 \right\}\] \[=\frac{29}{2}.(2+28)=\frac{29\times 30}{2}=29\times 15=435\] Thus x=7, y=6


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