CEE Kerala Engineering CEE Kerala Engineering Solved Paper-2004

  • question_answer
    The sum of the rational terms in the expansion of\[{{(\sqrt{2}+{{3}^{1/5}})}^{10}}\]is:

    A)  41                         

    B)         32

    C)  18                         

    D)         9

    E)  82

    Correct Answer: A

    Solution :

    \[{{({{2}^{1/2}}+{{3}^{1/5}})}^{10}}\] \[{{=}^{10}}{{C}_{0}}{{2}^{5}}{{+}^{10}}{{C}_{1}}{{2}^{9/2}}{{.3}^{1/5}}+....+\]                                                                 \[^{10}{{C}_{10}}{{2}^{0}}{{.3}^{2}}\] Thus, sum of rational terms of above expansion \[={{2}^{5}}+{{3}^{2}}\] \[=32+9=41\]


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