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yuanzhi's Question
Math
Posted 10 months ago

Determine whether the sequence converges or diverges. If it converges, find the limit. (If an DNE.)
an=(1)n8nlimnan=
\begin{array}{c}
a_{n}=\frac{(-1)^{n}}{8 \sqrt{n}} \\
\lim _{n \rightarrow \infty} a_{n}=\square
\end{array}

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Answer from Sia
Posted 10 months ago
Solution by Steps
step 1
We start by considering the given sequence: an=(1)n8na_n = \frac{(-1)^n}{8 \sqrt{n}}
step 2
To determine if the sequence converges, we need to find the limit as nn approaches infinity: limn(1)n8n\lim_{n \to \infty} \frac{(-1)^n}{8 \sqrt{n}}
step 3
Observe that (1)n(-1)^n oscillates between -1 and 1, but 8n8 \sqrt{n} grows without bound as nn approaches infinity
step 4
Therefore, the numerator (1)n(-1)^n is bounded, while the denominator 8n8 \sqrt{n} increases indefinitely
step 5
As nn approaches infinity, the fraction (1)n8n\frac{(-1)^n}{8 \sqrt{n}} approaches 0 because the denominator grows much faster than the numerator
step 6
Thus, limn(1)n8n=0\lim_{n \to \infty} \frac{(-1)^n}{8 \sqrt{n}} = 0
Answer
The sequence converges to 0.
Key Concept
Convergence of a sequence
Explanation
A sequence converges if its terms approach a specific value as nn approaches infinity. In this case, the sequence (1)n8n\frac{(-1)^n}{8 \sqrt{n}} converges to 0 because the denominator grows without bound while the numerator remains bounded.

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