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    Which of the following is/are true?

    A. 3 is not a rational number.
    B. If 'a' is rational and 'n' is an integer > 1, then an is rational.
    C. 7 is not the cube of a rational number.

    Options :-

    1. A and B
    2. A and C
    3. B and C
    4. A, B and C
    5. A only
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