N diverges so by the comparison test the series ln n

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Mathematics for Elementary School Teachers
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Chapter 3 / Exercise 23
Mathematics for Elementary School Teachers
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I I I C C I 3. (1 pt) Consider the series n = 1 1 n ( n + 3 ) Determine whether the series converges, and if it converges, determine its value. Converges (y/n): Value if convergent (blank otherwise): Correct Answers: Y 0.611111111111111 4. (1 pt) Match each of the following with the correct state-
ment. C stands for Convergent, D stands for Divergent. 1. 8 n 2. n = 1 1 2 + 4 n 6 3. n = 2 2 n 8 - 9 4. n = 1 2 n ( n + 3 ) 5. n = 1 8 + 7 n 8 + 2 n n = 1 ln ( n )
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1 n diverges, so by the Comparison Test, the series ln ( n ) n diverges. 6. For all n > 2, ln ( n ) n 2 > 1 n 2 , and the series 1 n 2 converges, so by the Comparison Test, the series ln ( n ) n 2 converges. 5. (1 pt) Use the ratio test to determine whether n = 14 n + 9 n ! converges or diverges. (a) Find the ratio of successive terms. Write your answer as a fully simplified fraction. For n 14, lim n a n + 1
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Mathematics for Elementary School Teachers
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Chapter 3 / Exercise 23
Mathematics for Elementary School Teachers
Bassarear
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(b) Evaluate the limit in the previous part. Enter as infinity and - as -infinity. If the limit does not exist, enter DNE. (c) By the ratio test, does the series converge, diverge, or is the test inconclusive? ? 6. (1 pt) Use the ratio test to determine whether 2 n converges or diverges. (a) Find the ratio of successive terms. Write your answer as a fully simplified fraction. For n 26, lim n (b) Evaluate the limit in the previous part. Enter as infinity and - as -infinity. If the limit does not exist, enter DNE. (c) By the ratio test, does the series converge, diverge, or is the test inconclusive? ?

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