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Railways Sample Paper RRB (Assistant Loco Pilot) Sample Test Paper-14

  • question_answer
    The digit in the unit's place of the number represented by \[({{7}^{95}}-{{3}^{58}})\]is:

    A)  0                    

    B)  4                    

    C)         6                    

    D)         7

    Correct Answer: B

    Solution :

    Unit digit in \[{{7}^{4}}\] is 1. So, unit digit in \[{{7}^{92}}\]is 1. \[\therefore \] Unit digit in \[{{7}^{95}}\] is 3. Unit digit in \[{{3}^{4}}\] is 1. \[\therefore \]Unit digit in \[{{3}^{56}}\] is 1. \[\therefore \]Unit digit in \[{{3}^{58}}\] is 9. \[\therefore \]Unit digit in \[({{7}^{95}}-{{3}^{58}})=(13-9)=4.\]


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