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KVPY Sample Paper KVPY Stream-SX Model Paper-5

  • question_answer
    The digit in the unit place of \[{{15}^{981}}+{{9}^{789}}-{{6}^{50}}\] is

    A) 8                     

    B) 6       

    C) 8                                 

    D) 9

    Correct Answer: A

    Solution :

    [a] The unit digit in \[{{(15)}^{981}}\] is 6. The unit digit in \[{{(9)}^{789}}\] is 9. The unit digit in \[{{(6)}^{50}}\]  is 6 \[\therefore \]The unit digit in \[{{(15)}^{981}}+{{(9)}^{789}}-{{(6)}^{50}}\] is \[5+9-6=8.\]    


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