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haha1234
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Homework Statement
I've found that the typical way for using ratio test is to find the limit of an+1/an However, my tutor said that radius of convergence can be found by finding the limit of an/an+1 and the x term is excluded.
For example:Finding the interval of convergence of n!xn/nn
my tutor will find it in this way:
lim n!/nn[itex]\bullet[/itex](n+1)n+1/(n+1)!
n[itex]\rightarrow∞[/itex]
And finally found that the interval of convergence is (-e,e)
However, when I found it in typical way, I found it is (-1,1)
Are both method correct?
And why I cannot find the correct answer?
Homework Equations
The Attempt at a Solution
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