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  3. JEE Main & Advanced

JEE Main & Advanced Sample Paper JEE Main Sample Paper-33

  • question_answer
    How many four digit PIN numbers can be made using only the digits 2, 3 and 4 and using each of these digits at least once in each PIN number?

    A)  24           

    B)                                     36

    C)  48         

    D)                                     72

    Correct Answer: B

    Solution :

    2 2 3 4 or 2 3 3 4 or 2 3 4 4 \[\Rightarrow \,3.\frac{4!}{2!}=36\]


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