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  1. AP Calculus
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Infinite Sequences and Series (BC Only)

Question 1
college-boardCalculus AB/BCAPExam Style
1 mark

Considering a function represented by a power series ∑n=0∞an(x−1)n\sum_{n=0}^{\infty} a_n (x-1)^n∑n=0∞​an​(x−1)n converges absolutely at x=3x=3x=3, how would you describe its behavior at x=−1x=-1x=−1?

Question 2
college-boardCalculus AB/BCAPExam Style
1 mark

If the power series ∑n=0∞(2x+3)n5n\sum_{n=0}^{\infty} \frac{(2x+3)^n}{5^n}∑n=0∞​5n(2x+3)n​ has a radius of convergence RRR, what is the interval of convergence for this series?

Question 3
college-boardCalculus AB/BCAPExam Style
1 mark

To find the radius of convergence for a power series, what must you first calculate from the general term ana_nan​?

Question 4
college-boardCalculus AB/BCAPExam Style
1 mark

What is the interval of convergence of the power series represented by the function f(x)=∑n=0∞(2x)nn2f(x) = \sum_{n=0}^{\infty} \frac{(2x)^n}{n^2}f(x)=∑n=0∞​n2(2x)n​?

Question 5
college-boardCalculus AB/BCAPExam Style
1 mark

If the power series for f(x)=∑n=0∞xnn!f(x) = \sum_{n=0}^{\infty} \frac{x^n}{n!}f(x)=∑n=0∞​n!xn​ converges on its interval of convergence, what is the radius of convergence for the related series g(x)=∑n=0∞(2x)nn!g(x) = \sum_{n=0}^{\infty} \frac{(2x)^n}{n!}g(x)=∑n=0∞​n!(2x)n​?

Question 6
college-boardCalculus AB/BCAPExam Style
1 mark

If a power series converges absolutely at x=ax = ax=a, then it will also converge when xxx equals what other value?

Question 7
college-boardCalculus AB/BCAPExam Style
1 mark

What is the interval of convergence of the power series represented by the function f(x)=∑n=1∞(x−2)nn3f(x) = \sum_{n=1}^{\infty} \frac{(x-2)^n}{n^3}f(x)=∑n=1∞​n3(x−2)n​?

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Question 8
college-boardCalculus AB/BCAPExam Style
1 mark

Given a power series ∑n=0∞(x−3)n2n\sum_{n=0}^{\infty} \frac{(x-3)^n}{2^n}∑n=0∞​2n(x−3)n​, using the Cauchy-Hadamard theorem as an alternative to the ratio test, what is the radius of convergence?

Question 9
college-boardCalculus AB/BCAPExam Style
1 mark

If the power series ∑n=0∞(3x)nn!\sum_{n=0}^{\infty} \frac{(3x)^n}{n!}∑n=0∞​n!(3x)n​ has a radius of convergence RRR, what is the interval of convergence for this series?

Question 10
college-boardCalculus AB/BCAPExam Style
1 mark

If the interval of convergence for a power series is (-4, 6), what can be said about the radius of convergence?