AP Calc Unit 10 Study Guide

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12 Terms

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What is a monotonic sequence?

A sequence that constantly increases or constantly decreases

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What is a convergent series?

A series with a partial sum that converges to a value as n approaches infinity.

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What is a geometric sequence?

A sequence where the same number is multiplied to each term to get the next in the sequence.

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When and where does a geometric series converge?

When the absolute value of r is less than 1, the series converges to arkĂ·(1-r) where ar is the first term.

<p>When the absolute value of r is less than 1, the series converges to ar<sup>k</sup>Ă·(1-r) where ar is the first term.</p>
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What is the nth term test for divergence?

If the limit of the nth term of a series as n approaches infinity doesn’t equal to 0, the series diverges.

<p>If the limit of the nth term of a series as n approaches infinity doesn’t equal to 0, the series diverges.</p>
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What is the integral test for convergence?

If f is a positive, continuous, and decreasing function for x ≥ k and an = f(x), then the sum of all terms in the series starting from n = k and the integral from k to infinity of f(x) both converge or both diverge.

<p>If f is a positive, continuous, and decreasing function for x ≥ k and a<sub>n</sub> = f(x), then the sum of all terms in the series starting from n = k and the integral from k to infinity of f(x) both converge or both diverge.</p>
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When does a p series converge or diverge?

Converges if p > 1

Diverges if 0 < p ≤ 1

<p>Converges if p &gt; 1</p><p>Diverges if 0 &lt; p ≤ 1</p>
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Do harmonic series converge or diverge?

Always diverge

<p>Always diverge</p>
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What is the comparison test for convergence?

If 0 < an ≤ bn for all n, then if the partial sum of b converges, the partial sum of a must converge. If the partial sum of a diverges, the partial sum of b must diverge.

<p>If 0 &lt; a<sub>n</sub> ≤ b<sub>n</sub> for all n, then if the partial sum of b converges, the partial sum of a must converge. If the partial sum of a diverges, the partial sum of b must diverge.</p>
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What is the Limit Comparison Test?

If both an and bn are greater than 0 and the limit of an divided by bn as n approaches infinity is finite and positive, then the partial sums of a and b either both converge or both diverge.

<p>If both a<sub>n</sub> and b<sub>n</sub> are greater than 0 and the limit of a<sub>n</sub> divided by b<sub>n</sub> as n approaches infinity is finite and positive, then the partial sums of a and b either both converge or both diverge.</p>
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What is the Alternating Series Test?

If an > 0, the limit as n approaches infinity of an = 0, and |an+1| ≤ |an| for all n, then the alternating series must converge. Otherwise, it must diverge.

<p>If a<sub>n</sub> &gt; 0, the limit as n approaches infinity of a<sub>n</sub> = 0, and |a<sub>n+1</sub>| ≤ |a<sub>n</sub>| for all n, then the alternating series must converge. Otherwise, it must diverge.</p>
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What is the Ratio Test for Convergence?

If an infinite series an has positive terms, then if the limit of a divided by