Write out the first eight terms of each series to show how the series starts. Then find the sum of the series or show that it diverges. sum_{n=2}^inftyfrac{1}{4^n}

sjeikdom0

sjeikdom0

Answered question

2021-03-07

Write out the first eight terms of each series to show how the series starts. Then find the sum of the series or show that it diverges.
n=214n

Answer & Explanation

okomgcae

okomgcae

Skilled2021-03-08Added 93 answers

First eight terms are:
142,143,144,145,146,147,148,149
=116,164,1256,11024,14096,116384,165536,1262144
So we see that the denominator is increasing, this means the terms are approaching 0
So the series will converge
That is a geometric series with common ratio =14
And first term =116
Then we use the infinite geometric series sum formula
a1r=116114=11634=116×43=112
Answer: 112
Jeffrey Jordon

Jeffrey Jordon

Expert2021-12-27Added 2605 answers

Answer is given below (on video)

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