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  3. RAJASTHAN ­ PET

RAJASTHAN ­ PET Rajasthan PET Solved Paper-2004

  • question_answer
    Six boys and six girls are sitting in a row. The probability that all 6 girls sit together, is

    A)  \[\frac{1}{102}\]

    B)  \[\frac{1}{112}\]

    C)  \[\frac{1}{122}\]

    D)  \[\frac{1}{132}\]

    Correct Answer: D

    Solution :

     Probability of sitting all girls together \[=\frac{(6+1)!6!}{12!}\] \[=\frac{7!6!}{12.11.10.9.8.7!}\] \[=\frac{1.2.3.4.5.6}{12.11.10.9.8}\] \[=\frac{1}{132}\]


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