Posted by **Steven** on Wednesday, April 16, 2008 at 1:22pm.

can someone tell me wich one of the two awnsers for these two limits is correct?

lim (-1)^(n) = 1 or -1

n-> +infinity

lim (-1)^(n) = 1 or -1

n-> -infinity

Thanks in advance.

- calculating infinity -
**Reiny**, Wednesday, April 16, 2008 at 1:59pm
depends on n

if n is even then the answer is +1

if n is odd you get -1

for:

lim (-1)^(n) = 1 or -1

n-> -infinity

is really the same as

lim 1/(-1)^(n)

so the same reasoning as above applies

- calculating infinity -
**Steven**, Wednesday, April 16, 2008 at 3:47pm
1) I get it, except for

lim (-1)^(n) = ?

n-> +infinity

is infinity even or odd?

This is important because the result determines wheter the series that i was given is convergent or divergent.

2) in another excercise I encauntered the following problem:

is the following calculation with infinity allowed?:

lim (ln (n))^(1/n) = (ln (inf.))^(0)=1

n-> +inf.

Again txs for awnsering.

## Answer this Question

## Related Questions

- Calc. Limits - Are these correct? lim x->0 (x)/(sqrt(x^2+4) - 2) I get 4/0...
- calc - Are these correct? lim x->0 (x)/(sqrt(x^2+4) - 2) I get 4/0= +/- ...
- Calc Please Help - Are these correct? lim x->0 (x)/(sqrt(x^2+4) - 2) I get 4/...
- Math - 1. If -1/infinity = infinity or -infinity ? 2. If lim x->infinity^- = ...
- Math - 1. If -1/infinity = infinity or -infinity ? 2. If lim x->infinity^- = ...
- Calculus - Find the horizontal asymptote of f(x)=e^x - x lim x->infinity (e^x...
- Pre-cal - Please determine the following limits if they exist. If the limit does...
- calculus - interval of convergence - infinity of the summation n=0: ((n+2)/(10^n...
- math - i really dont understand why this 1-lim 3/(y+4) [the lim is x->...
- calculus - interval of convergence - infinity of the summation n=0: ((n+2)/(10^...