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7th Class Mathematics Integers Question Bank Number System and Operations

  • question_answer
    If\[{{2}^{n}}-1\]is a prime number , then \[{{2}^{n}}^{-1}\left( {{2}^{n}}-1 \right)\] is_____

    A)  a prime number  

    B)         a super number

    C)  a perfect number

    D)         an odd number

    E)  None of these

    Correct Answer: C

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