JEE Main & Advanced Mathematics Permutations and Combinations Question Bank Definition of combinations, Conditional combinations, Division into groups, Derangements

  • question_answer
    To fill 12 vacancies there are 25 candidates of which five are from scheduled caste. If 3 of the vacancies are reserved for scheduled caste candidates while the rest are open to all, then the number of ways in which the selection can be made [RPET 1981]

    A) \[^{5}{{C}_{3}}{{\times }^{22}}{{C}_{9}}\]

    B) \[^{22}{{C}_{9}}{{-}^{5}}{{C}_{3}}\]

    C) \[^{22}{{C}_{3}}{{+}^{5}}{{C}_{3}}\]

    D) None of these

    Correct Answer: A

    Solution :

    The selection can be made in \[^{5}{{C}_{3}}{{\times }^{22}}{{C}_{9}}\]. {Since 3 vacancies filled from 5 candidates in \[^{5}{{C}_{3}}\] ways and now remaining candidates are 22 and remaining seats are 9}.


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