nth term divergence test | Series | AP Calculus BC | Khan Academy | Summary and Q&A

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August 22, 2014
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nth term divergence test | Series | AP Calculus BC | Khan Academy

TL;DR

The divergence test is used to determine if an infinite series will definitely diverge based on the limit as N approaches infinity, and it cannot determine if a series will converge.

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Questions & Answers

Q: How does the divergence test help determine if an infinite series will converge or diverge?

The divergence test helps determine if an infinite series will definitely diverge by checking if the limit as N approaches infinity of A sub N is not equal to zero. If it is not zero, the series will diverge.

Q: Can the divergence test determine if a series will converge?

No, the divergence test can only determine if a series will definitely diverge. It cannot determine if a series will converge.

Q: What is the significance of the limit as N approaches infinity in the divergence test?

The limit as N approaches infinity helps determine the behavior of the terms in the infinite series. If the limit is not zero, it indicates that the series will diverge.

Q: Why is it important for the terms in an infinite series to approach zero for convergence?

In order for an infinite series to converge, the terms must get smaller and smaller as N approaches infinity. If the terms do not approach zero, the series will diverge.

Summary & Key Takeaways

  • The divergence test is a basic and intuitive method to determine if an infinite series will diverge or not.

  • The test states that if the limit as N approaches infinity of A sub N does not equal zero, then the series will diverge.

  • The test is useful for identifying series that definitely diverge, but it cannot determine if a series will converge.

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