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JEE Main & Advanced Sample Paper JEE Main Sample Paper-1

  • question_answer
    The sum of the digits in the unit place of all the numbers formed with the help of 3, 4, 5, 8 taken all at a time, is

    A)  432                                       

    B)  120

    C)  36                                         

    D)  18     

    Correct Answer: B

    Solution :

     Suppose times we fix a one number in a unit place, then rest of the three numbers can arrange is 3!ie, 6. It means, a number which is in unit place is added 6 times. Similary, this process is going on rest of the numbers. \[\therefore \]Sum of the digits in the unit's place of all the numbers \[=(3+4+5+8)\times 6=20\times 6=120\]


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