\(lim_{π‘₯β†’βˆž} \ \ π‘₯^{1/π‘₯} \)

2015

\(lim_{π‘₯β†’βˆž} \ \ π‘₯^{1/π‘₯} \)

  1. A.

    ∞

  2. B.

    0

  3. C.

    1

  4. D.

    Not defined

Attempted by 73 students.

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Correct answer: C

Key idea: rewrite the power using the exponential and natural logarithm to evaluate the limit of the exponent.

  1. Rewrite the expression: x^{1/x} = exp((1/x) \u200bln x).

  2. Evaluate the exponent: consider (ln x)/x as x β†’ ∞. This ratio tends to 0 (for example, apply l'HΓ΄pital's rule: derivative of ln x is 1/x and derivative of x is 1, so the limit is 0).

  3. Conclude the limit: exp((ln x)/x) β†’ exp(0) = 1, so the limit of x^{1/x} as x β†’ ∞ is 1.

Therefore the limit equals 1.

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