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

  • question_answer
    If \[2\times {}^{n}{{C}_{5}}=9\,\,\times \,\,{}^{n-2}{{C}_{5}}\],  then the value of n will be

    A) 7

    B) 10

    C) 9

    D) 5

    Correct Answer: B

    Solution :

    By inspection\[n=10\].


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