5. Let {a} be a Cauchy sequence. Does {an} have to be a Cauchy sequence? Hint: Give an example of a sequence {a} that converges (and so Cauchy), but {an} does not converge (and so not Cauchy).

College Algebra
10th Edition
ISBN:9781337282291
Author:Ron Larson
Publisher:Ron Larson
Chapter8: Sequences, Series,and Probability
Section8.3: Geometric Sequences And Series
Problem 3ECP: Find the 12th term of the geometric sequence whose first term is 14 and whose common ratio is 1.2.
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#5. Thank you. 

5. Let {a} be a Cauchy sequence. Does {an} have to be a Cauchy sequence? Hint: Give an
example of a sequence {a} that converges (and so Cauchy), but {an} does not converge (and
so not Cauchy).
Transcribed Image Text:5. Let {a} be a Cauchy sequence. Does {an} have to be a Cauchy sequence? Hint: Give an example of a sequence {a} that converges (and so Cauchy), but {an} does not converge (and so not Cauchy).
Expert Solution
Step 1

We know that

i) every constant sequence is convergent and converges to that constant number.

ii) A sequence is said to be  Cauchy sequence in

If and only if it is convergent in R.

 

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