- #1
miglo
- 98
- 0
Homework Statement
[tex]a_n=(\frac{1}{n})^{\frac{1}{\ln{n}}}[/tex]
Homework Equations
The Attempt at a Solution
[tex]\lim_{x\rightarrow \infty}(\frac{1}{n})^{\frac{1}{\ln{n}}}[/tex]
[tex]y=(\frac{1}{n})^{\frac{1}{\ln{n}}}[/tex]
[tex]\ln{y}=\frac{\ln{\frac{1}{n}}}{\ln{n}}[/tex]
[tex]\ln{y}=\frac{\ln{1}-\ln{n}}{\ln{n}}[/tex]
[tex]\ln{y}=\frac{\ln{1}}{\ln{n}}-\frac{\ln{n}}{\ln{n}}[/tex]
[tex]\ln{y}=0-1[/tex]
[tex]e^{\ln{y}}=e^{-1}[/tex]
[tex]\lim_{x\rightarrow \infty}(\frac{1}{n})^{\frac{1}{\ln{n}}}=e^{-1}[/tex]
the back of my book says the answer is indeed [itex]e^{-1}[/itex] but I am not sure if this is the way to go to for the solution or whether I am supposed to rewrite it as something similar to [itex]\lim_{x\rightarrow \infty}(1+\frac{x}{n})^{n}[/itex]