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Write the terms \(a_{1}, a_{2}, a_{3},\) and \(a_{4}\) of the following sequences. If the sequence appears to converge, make a conjecture about its limit. If the sequence diverges, explain why. $$a_{n}=\frac{1}{10^{n}}, n=1,2,3, \dots$$

Short Answer

Expert verified
Answer: The first four terms of the sequence are: \[\frac{1}{10}, \frac{1}{100}, \frac{1}{1000}, \text{ and } \frac{1}{10000}.\] Based on the pattern of the terms, it is conjectured that the sequence converges to 0 as its limit.

Step by step solution

01

Finding \(a_1\)

To find the first term of the sequence, we need to replace n with 1 in the given formula: $$a_1 = \frac{1}{10^1} = \frac{1}{10}$$So, \(a_1 = \frac{1}{10}\).
02

Finding \(a_2\)

To find the second term of the sequence, we need to replace n with 2 in the given formula: $$a_2 = \frac{1}{10^2} = \frac{1}{100}$$So, \(a_2 = \frac{1}{100}\).
03

Finding \(a_3\)

To find the third term of the sequence, we need to replace n with 3 in the given formula: $$a_3 = \frac{1}{10^3} = \frac{1}{1000}$$So, \(a_3 = \frac{1}{1000}\).
04

Finding \(a_4\)

To find the fourth term of the sequence, we need to replace n with 4 in the given formula: $$a_4 = \frac{1}{10^4} = \frac{1}{10000}$$So, \(a_4 = \frac{1}{10000}\).
05

Making a Conjecture

From the terms calculated above, we can see that the sequence is: $$\frac{1}{10}, \frac{1}{100}, \frac{1}{1000}, \frac{1}{10000}, \ldots$$This sequence appears to be getting smaller and smaller as n increases. If we observe the pattern, we can conjecture that as n approaches infinity \((n \to \infty)\), the terms will be getting closer and closer to 0. This suggests that the sequence converges to 0 as its limit.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

limits in calculus
When we talk about limits in calculus, we are exploring the behavior of a sequence or function as it moves toward a certain point. In the context of sequences, a limit tells us the value that the terms of the sequence approach as the sequence extends onwards. In simple terms, if a sequence approaches a specific number, this number is considered the sequence's limit.

For instance, in our given sequence, every term is getting smaller and closer to zero. Mathematically, we express this by saying the limit of the sequence \(a_n = \frac{1}{10^n}\) as \(n\) approaches infinity is 0. This is denoted as \(\lim_{{n \to \infty}} a_n = 0\)
  • Calculating limits involves assessing the behavior of the sequence or function for very large values of \(n\)
  • If the terms keep approaching a specific value, the sequence is said to have a limit, meaning it converges to that value.
  • A sequence that does not approach any particular value is said to diverge.
Understanding limits is crucial for grasping more advanced concepts in calculus, such as integration and differentiation, making it a foundational part of mathematical analysis.
infinite sequences
An infinite sequence is a list of numbers written in a specific order, which continues endlessly. Each number in the sequence is called a term. In our example, the sequence \(a_n = \frac{1}{10^n}\) constitutes an infinite sequence.

Infinite sequences are significant in calculus as they help us study the behavior of functions and series as we consider values approaching infinity.
  • The first few terms effectively describe the pattern and help us understand the behavior of the sequence.
  • As we examine more terms, we observe whether the sequence â– ctends to infinite growth or diminishes toward a particular value.
For the given sequence, the terms \(\frac{1}{10}, \frac{1}{100}, \frac{1}{1000}, \frac{1}{10000}, \ldots\) show a recurring pattern where each term becomes smaller, indicating convergence to zero.

Infinite sequences play a critical role in advanced calculus topics, providing the groundwork for series analysis, functions, and more complex mathematical structures.
mathematical conjecture
A mathematical conjecture is an educated guess or hypothesis that arises from observing patterns or relationships within mathematical problems. Conjectures are not proven but are formulated based on evidence or examples.

In the context of the sequence problem, we made a conjecture that the sequence converges to zero. This inference is based on observing the pattern that the terms of the sequence \(a_n = \frac{1}{10^n}\) become exceedingly small as \(n\) increases.

Mathematical conjectures are vital in mathematics because they drive new discoveries and open avenues for proving new theorems:
  • They prompt further investigation and mathematical research to establish proof or identify counterexamples.
  • Once a conjecture is proven, it transitions from a hypothesis to a theorem, gaining acceptance as a mathematical truth.
Thus, while initially tentative, conjectures set the stage for potential advances in mathematical thinking and knowledge.

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Most popular questions from this chapter

A heifer weighing 200 lb today gains 5 lb per day with a food cost of \(45 \mathrm{c} /\) day. The price for heifers is \(65 \mathrm{q} / \mathrm{lb}\) today but is falling \(1 \% /\) day. a. Let \(h_{n}\) be the profit in selling the heifer on the \(n\) th day, where \(h_{0}=(200 \mathrm{lb}) \cdot(\$ 0.65 / \mathrm{lb})=\$ 130 .\) Write out the first 10 terms of the sequence \(\left\\{h_{n}\right\\}\). b. How many days after today should the heifer be sold to maximize the profit?

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Consider a wedding cake of infinite height, each layer of which is a right circular cylinder of height 1. The bottom layer of the cake has a radius of \(1,\) the second layer has a radius of \(1 / 2,\) the third layer has a radius of \(1 / 3,\) and the \(n\) th layer has a radius of \(1 / n\) (see figure). a. To determine how much frosting is needed to cover the cake, find the area of the lateral (vertical) sides of the wedding cake. What is the area of the horizontal surfaces of the cake? b. Determine the volume of the cake. (Hint: Use the result of Exercise 66.) c. Comment on your answers to parts (a) and (b).

Consider the following sequences defined by a recurrence relation. Use a calculator, analytical methods, and/or graphing to make a conjecture about the limit of the sequence or state that the sequence diverges. $$a_{n+1}=4 a_{n}\left(1-a_{n}\right) ; a_{0}=0.5$$

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