11th Class Mathematics Sample Paper Maths Olympiad Model Test Paper-10

  • question_answer
    Let\[{{a}_{n}}=\underbrace{111........1}_{n\,times},\] then which one among the following is not true?

    A)  \[{{a}_{912}}\]is not prime       

    B)  \[{{a}_{951}}\] is not prime

    C)  \[{{a}_{480}}\] is not prime      

    D)  \[{{a}_{91}}\] is prime

    E)  None of these

    Correct Answer: D

    Solution :

     Not Available

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