KVPY Sample Paper KVPY Stream-SX Model Paper-10

  • question_answer
    \[\underset{x\,\to \,\infty }{\mathop{\text{Limit}}}\,\frac{{{x}^{n}}}{{{e}^{x}}}=0\] (n integer), for:

    A) no value of n     

    B) all values of n

    C) only negative values of n

    D) only positive values of n

    Correct Answer: B

    Solution :

    \[\underset{x\,\to \,\infty }{\mathop{Limit}}\,\frac{{{x}^{n}}}{{{e}^{x}}}=0\]is not an interminate from fro \[n\ge 0\]
    \[\Rightarrow \]   limit is equal to zero for n > 0
    \[\underset{x\,\to \,\infty }{\mathop{Limit}}\,\frac{{{x}^{n}}}{{{e}^{x}}}=\underset{x\,\to \,\infty }{\mathop{Limit}}\,\frac{n\,(n-1)\,\,(n-2).....1}{{{e}^{x}}}=0\]


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