For which x > 0 does the generalized ratio test imply convergence of \sum_{n=1}^\infty a_{n}?

ossidianaZ

ossidianaZ

Answered question

2021-08-14

The following advanced exercise use a generalized ratio test to determine convergence of some series that arise in particular applications, including the ratio and root test, are not powerful enough to determine their convergence.

The test states that if

 limna2nan<1/2

then an converges,while if

limna2n+1an>1/2,

then an  diverges. Let an=11+x22+xnn+x1n=(n1)!(1+x)(2+x)(n+x).

Show that a2n/anex/2/2  .

For which x > 0 does the generalized ratio test imply convergence of n=1an?

Answer & Explanation

Derrick

Derrick

Skilled2021-08-15Added 94 answers

a2nanex22
No, he ratio test does NOT imply the convergence for n=1an.

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