AP Calculus BC Practice Questions
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Questions and Answers

Which of the following series converges for all real numbers x?

  • $\sum \frac{1}{n^2}$ (correct)
  • $\sum \frac{1}{2^n}$
  • $\sum \frac{1}{n}$
  • $\sum \frac{1}{n^3}$

What are all values of x for which the series converges?

  • |x| > 3
  • |x| = 3
  • All x except x = 0 (correct)
  • |x| = 2

Which of the following series can be used with the limit comparison test to determine convergence or divergence?

  • $\sum \frac{1}{n^4}$ (correct)
  • $\sum \frac{1}{n^3}$
  • $\sum \frac{1}{n!}$
  • $\sum \frac{1}{2^n}$

Which of the following series diverges?

<p>$\sum \frac{1}{n!}$ (A)</p> Signup and view all the answers

Which of the following series can be used with the limit comparison test to determine convergence or divergence?

<p>$\sum \frac{1}{n^3}$ (B)</p> Signup and view all the answers

What are all values of x for which the series diverges?

<p>|x| &gt; 3 (A)</p> Signup and view all the answers

If the series $\sum_{n=1}^\infty \frac{1}{n^p}$ converges, what are all values of p for which this is true?

<p>$p &lt; 1$ (A)</p> Signup and view all the answers

If $f$ is a positive, continuous, decreasing function and the series $\sum_{n=1}^\infty f(n)$ converges, which of the following statements about the function $f$ must be true?

<p>$f(x)$ has a limit of 0 (C)</p> Signup and view all the answers

Consider the infinite series $\sum_{n=1}^\infty g(n)$. If the integral test can be used to verify convergence because $g(x)$ is positive, continuous, and decreasing, which inequality is true?

<p>$\frac{dg}{dx} &lt; 0$ (C)</p> Signup and view all the answers

The integral test can be used to determine which of the following statements about an infinite series is true?

<p>The series diverges because $\int g(x)dx &gt; 0$ (D)</p> Signup and view all the answers

If $\sum_{n=1}^\infty h(n)$ is an infinite series where $h(n)$ has no finite limit, what conclusions can be drawn using the integral test?

<p>The series diverges, and terms have a limit of 0. (C)</p> Signup and view all the answers

If $f$ is a positive, continuous, decreasing function and $\sum_{n=1}^\infty f(n)$ converges to k, what must be true about this convergence?

<p>$k$ converges (A)</p> Signup and view all the answers

What must be true if the series converges for all n?

<p>The series converges for all n (B)</p> Signup and view all the answers

For the infinite series with nth partial sum for $a_n$, what is the sum of the series?

<p>$a_n$ (D)</p> Signup and view all the answers

Consider the sequence $a_n$ and the infinite series. Which of the following is true?

<p>$a_n$ diverges and the series diverges (B)</p> Signup and view all the answers

If $p > 1$ for $rac{1}{n^p}$, which of the following statements about the infinite series is true?

<p>The series diverges (C)</p> Signup and view all the answers

Which of the following series diverge?

<p>I, II, and III (B)</p> Signup and view all the answers

Which term test can be used to determine divergence for the given series?

<p>I and III only (D)</p> Signup and view all the answers

Flashcards

Convergence for all x

The series converges for all real values of x. It is important to note that x can take on any real number, and the series will still converge.

Convergence except at x = 0

The series converges for all real values of x except for x = 0. This is because the series becomes undefined at x = 0 and therefore cannot be evaluated.

Limit Comparison Test

The limit comparison test can be used to determine if a series converges or diverges by comparing it to another series that is known to converge or diverge. The Limit Comparison Test: If $ ewline$ $ ewline$ lim$_{n→∞}$ [a(n)/b(n)] = c, where c is a finite number and c > 0, then both series either converge or both diverge.

Divergent Series

The series diverges. This is because the harmonic series is a known divergent series.

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Limit Comparison for Convergence/Divergence

The limit comparison test can be used to determine convergence or divergence of a series. If the limit of the ratio of the terms of two series is a positive finite number, then the two series either both converge or both diverge.

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Divergence for |x| > 3

The series diverges for all values of x where the absolute value of x is greater than 3. This is because the series does not converge if the absolute value of x is greater than 3.

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Convergence of ∑(1/n^p)

For the series $ ewline$ $ ewline$ ∑(1/n^p), where p is a real number, it converges if p is greater than 1; it diverges if p is less than or equal to 1. Consider the cases p = 1 and p < 1. If p < 1, then the given series becomes a harmonic series which diverges.

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f(x) limit of 0

If f(x) is positive, continuous, and decreasing for x greater than or equal to 1, and if the series ∑f(n) converges, then the limit of f(x) as x approaches infinity must be zero. The integral test states that the series ∑f(n) converges if and only if the corresponding improper integral ∫f(x) dx converges.

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Convergence using Integral Test

If g(x) is positive, continuous, and decreasing for x greater than or equal to 1, then the integral test can be used to determine convergence. This means that the first derivative, dg/dx, must be negative.

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Series Divergence using Integral Test

The integral test can be used to determine if a series converges or diverges. If the improper integral of the function corresponding to the series diverges, then the series diverges. The integral test states that the series ∑f(n) converges if and only if the corresponding improper integral ∫f(x) dx converges.

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Divergence with No Finite Limit

If h(n) does not have a finite limit as n approaches infinity, then the integral test cannot be used to determine convergence or divergence. However, since there is no finite limit, the series diverges. Additionally, the terms of the series must have a limit of 0 for the series to converge. If the terms do not approach 0, then the series diverges.

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Convergence of Infinite Series

If f(x) is positive, continuous, and decreasing for x greater than or equal to 1, and ∑f(n) converges to a finite value k, then this value k represents the sum of the infinite series. The convergence of the series means that the sum of the infinite series approaches a finite value.

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Convergence for all n

If the series converges for all values of n, then the series is a convergent series. This means that the terms of the series approach a finite value as n approaches infinity. In other words, the sum of the series exists and is finite. Such behavior is characteristic of convergent series and ensures the series does not diverge.

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Sum of the Series

The sum of the series is the limit of the nth partial sum as n approaches infinity. This is the sum the series converges to. The nth partial sum is the sum of the first n terms of the series. In other words, the sum of the infinite series is the limit of the sum of the first n terms as n becomes infinitely large. This limit represents the value the series approaches as we include more and more terms, and it defines the overall sum of the series.

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Sequence & Series Divergence

If the sequence a_n diverges, then the infinite series also diverges. Divergence of the sequence indicates that the terms of the sequence do not approach a finite number as n goes to infinity. Consequently, the series formed by those terms also diverges as the sum of these terms will not converge to a finite value.

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Convergence for p > 1

If p is greater than 1 for the term 1/n^p, then the infinite series converges. The series converges because the value of n^p grows much faster than n as n approaches infinity, indicating that the individual terms decrease rapidly enough for the series to converge to a finite sum. This is a fundamental result for understanding the convergence of p-series.

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Divergent Series

The series diverges for all cases. This is because the series does not converge. The provided information indicates that the listed series do not converge, meaning their sums do not approach a finite value. These series are divergent.

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Divergence using the nth Term Test

The term test can be used to determine divergence for series I and III. The nth term test for divergence states that if the limit of the nth term of a series does not equal zero, then the series diverges. If the limit does not equal zero, then the series does not approach zero as n approaches infinity. Therefore, the condition for the series to converge, where the terms must eventually become arbitrarily small, is not satisfied. Therefore, the series diverges.

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