Calculate Limit of Sequence: n -> ∞

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SUMMARY

The limit of the sequence defined by the expression \(\frac{1 - 2 + 3 - ... + (2n - 1) - 2n}{\sqrt{n^2 + 1}}\) as \(n\) approaches infinity is conclusively -1. Participants in the discussion emphasized that applying Stolz's theorem is unnecessary for this problem. Instead, simplifying the numerator into a more compact form is the recommended approach to reach the solution effectively.

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Homework Statement


Calculate the limit of a given sequence for n \rightarrow \infty:

\frac{1 - 2 + 3 - ... + (2n - 1) - 2n}{\sqrt{n^2 + 1}}

The Attempt at a Solution


The correct answer seems to be -1. I've tried to apply the Stolz theorem but failed to compute \sqrt{(n + 1)^2 + 1} - \sqrt{n^2 + 1}. Will be grateful for any hints.
 
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Simplify the numerator and see if you can incorporate it somehow into the a square root. You should not need to use Stolz's theorem.
 
I agree with Tedjn.
No need of Stolz's theorem.
Just try to write the numerator in a compact expression.
 

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