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JEE Main & Advanced Mathematics Permutations and Combinations Question Bank Definition of permutation, Number of permutations with or without repetition, Conditional permutations

  • question_answer
    Assuming that no two consecutive digits are same, the number of n digit numbers, is [Orissa JEE 2004]

    A) n!

    B) 9!

    C) \[{{9}^{n}}\]

    D) \[{{n}^{9}}\]

    Correct Answer: A

    Solution :

    It is obvious.


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