Textbook Question
13–52. Limits of sequences
Find the limit of the following sequences or determine that the sequence diverges.
{ⁿ√(e³ⁿ⁺⁴)}
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14. Sequences & Series
Sequences
1:46 minutesProblem 10.2.83a
Textbook Question
Explain why or why not
Determine whether the following statements are true and give an explanation or counterexample.
a.If limₙ→∞aₙ = 1 and limₙ→∞bₙ = 3, then limₙ→∞(bₙ / aₙ) = 3.
Verified step by step guidance1
Recall the limit laws for sequences: if \( \lim_{n \to \infty} a_n = A \) and \( \lim_{n \to \infty} b_n = B \), and if \( A \neq 0 \), then \( \lim_{n \to \infty} \frac{b_n}{a_n} = \frac{B}{A} \).
Given \( \lim_{n \to \infty} a_n = 1 \) and \( \lim_{n \to \infty} b_n = 3 \), since \( a_n \) approaches 1 (which is not zero), the limit of the quotient should be \( \frac{3}{1} = 3 \).
Therefore, the statement \( \lim_{n \to \infty} \frac{b_n}{a_n} = 3 \) is true under these conditions.
To confirm, consider that the denominator sequence \( a_n \) does not approach zero, so division by \( a_n \) is well-defined in the limit.
Hence, the limit of the quotient is the quotient of the limits, which justifies the statement.
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Video duration:
1mKey Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Limit of a Sequence
The limit of a sequence is the value that the terms of the sequence approach as the index goes to infinity. If a sequence converges to a limit, its terms get arbitrarily close to that limit for sufficiently large indices.
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Introduction to Sequences
Limit Laws for Sequences
Limit laws allow us to compute limits of combined sequences using operations like addition, multiplication, and division, provided the limits of individual sequences exist and, in the case of division, the denominator's limit is not zero.
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Counterexamples in Limit Problems
Counterexamples demonstrate that a general statement is false by providing a specific case where the statement fails. In limit problems, they help test the validity of limit laws or assumptions, especially when conditions like nonzero denominators are involved.
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