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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
    How many numbers consisting of 5 digits can be formed in which the digits 3, 4 and 7 are used only once and the digit 5 is used twice

    A) 30

    B) 60

    C) 45

    D) 90

    Correct Answer: B

    Solution :

    Required number of ways are \[\frac{5\,!}{2\,!}=60\].


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