Use the comparison test or the limit comparison test to decide if each of these converges or 1 Σ 1+ Vk k=1 3k + 5 k=1
Use the comparison test or the limit comparison test to decide if each of these converges or 1 Σ 1+ Vk k=1 3k + 5 k=1
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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Part a.)
We have,
1 < sqrt(k) or 1 + sqrt(k) < 2sqrt(k) for all k.
So, 1 / (1 + sqrt(k)) > 1 / 2sqrt(k).
Now, apply Summation from k = 1 to ♾ on both sides of the above inequality to obtain that the required series is divergent using the comparison test as series on the right side is divergent.
Note that Summation k = 1 to ♾ 1 / 2sqrt(k) is divergent as Summation k = 1 to ♾ 1/ kp is divergent if p <_ 1, here p =1/2 < 1.
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