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  3. RAJASTHAN ­ PET

RAJASTHAN ­ PET Rajasthan PET Solved Paper-2011

  • question_answer
    The number of five digit telephone numbers having at least one of their digits repeated is

    A)  90000         

    B)  100000

    C)  30240         

    D)  69760

    Correct Answer: D

    Solution :

     Number of numbers with repetition \[=10\times 10\times 10\times 10\times 10=100000\] Number of numbers without repetition \[=10\times 9\times 8\times 7\times 6=30240\] \[\therefore \]Number of numbers with at least one digit repeated \[=100000-30240\]     \[=69760\]


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