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

  • question_answer
    In how many ways can \[mn\] letters be posted in \[n\] letter-boxes

    A) \[{{(mn)}^{n}}\]

    B) \[{{m}^{mn}}\]

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

    D) None of these

    Correct Answer: C

    Solution :

    Required number of ways are \[{{n}^{mn}}\] since each letter may be posted in \[n\] ways.

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