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Give examples of sequences satisfying the given conditions or explain why such an example cannot exist.

A convergent sequence that is not eventually monotonic.

Short Answer

Expert verified

Examples of the sequences is -1kk+6.

Step by step solution

01

Step 1. Given information.

Consider the given question,

A convergent sequence that is not eventually monotonic.

02

Step 2. Take the sequence -1kk+6.

Consider the sequence -1kk+6.

In the sequence ak=-1kk+6the general term is given below,

ak=-1kk+6

The sequence ak=-1kk+6is not a monotonic sequence because sign of -1kk+6 varies alternately as k increases.

Hence, the given sequence is not a monotonic sequence.

03

Step 3. Take the sequence 

The sequence ak=-1kk+6is a bounded sequence because 0ak17for k>0.

The given sequence has upper and lower bounds, then the sequence is bounded.

The limit of the sequence is ak=-1kk+6,

localid="1649178846922" limka=limk-1kk+6=0

The sequenceak=-1kk+6is not monotonic but bounded.

Hence, the sequence converges to0.

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