JEE Main & Advanced Mathematics Binomial Theorem and Mathematical Induction Question Bank Critical Thinking

  • question_answer
    The sum of the coefficients in the expansion of \[{{(x+y)}^{n}}\] is 4096. The greatest coefficient in the expansion is [Kurukshetra CEE 1998; AIEEE 2002]

    A) 1024

    B) 924

    C) 824

    D) 724

    Correct Answer: B

    Solution :

    By hypothesis, \[{{2}^{n}}=4096={{2}^{12}}\Rightarrow n=12\] Since n is even, hence greatest coefficient \[={{\,}^{n}}{{C}_{n/2}}={{\,}^{12}}{{C}_{6}}=\frac{12.11.10.9.8.7}{1.2.3.4.5.6}=924\].


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