Using the root test or otherwise, determine whether the given series

converges or diverges.

∞

A) ∑ (n^2+1/2n^2+n)^n

n=1

∞B) ∑ (1-2/n)^n^2

n=1

Printable View

- November 19th 2013, 04:16 PMDfaulk044Root Test for series
Using the root test or otherwise, determine whether the given series

converges or diverges.

∞

A) ∑ (n^2+1/2n^2+n)^n

n=1

∞B) ∑ (1-2/n)^n^2

n=1

- November 19th 2013, 05:14 PMSlipEternalRe: Root Test for series
I can't read your post. What is in the numerator, what is in the denominator, what is being taken to the n-th power? Use more parentheses.

- November 19th 2013, 05:37 PMHallsofIvyRe: Root Test for series
I

**think**you mean

(what you wrote was a sum of )

Since you mention the**root test**, the nth root of each term is . What is the limit of that as n goes to infinity? What does that tell you about the sum?

Quote:

n=1

∞B) ∑ (1-2/n)^n^2

n=1

The nth root of that is . What is the limit of that? (You really need to know that .) - November 20th 2013, 07:20 AMSlipEternalRe: Root Test for series
Also helpful is the fact that .