# calculating infinity

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

lim (-1)^(n) = 1 or -1
n-> +infinity
lim (-1)^(n) = 1 or -1
n-> -infinity

1. 👍 0
2. 👎 0
3. 👁 44
1. 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

1. 👍 0
2. 👎 0
posted by Reiny
2. 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.

1. 👍 0
2. 👎 0
posted by Steven

## Similar Questions

1. ### stats

a test consists of 25 multiple choice questions. Each has 5 possible answers, which only one is correct. If a student guesses on each question, find the following: a) prob that he will guess all of them right b)prob that he will

asked by gio on February 18, 2011
2. ### probability

a multiple choice test consists of 8 questions, each with 4 possible answers but only one of which is correct.what is the probability that an unprepared student will, by chance, get, a. all correct answers, b. exactly 5 correct

asked by marie on March 12, 2014
3. ### probability and statistics

a multiple choice test onsists of 8 questions, each with 4 possible answers but only one of which is correct.what is the probability that an unprepared student will, by chance, get, a. all correct answers, b. exactly 5 correct

asked by marie on March 12, 2014
4. ### Math

There are six true-false questions on a quiz. Not knowing any of the answers, a student guesses randomly. Find the probability of each event. Exactly two answers are correct. Exactly six answers are correct. At least five are

asked by Jen on May 10, 2016
5. ### Statistics

Multiple Choice Which of the following statements is true about the 95% confidence interval of the average of a sample? A) 95 of 100 avgs of samples will be within the limits of the confidence interval. B) There is a 95% chance

asked by Andrew on July 26, 2013
6. ### Multiplevariable calculus

Hello, I have to find the volume of the region enclosed by the paraboloid z=(x^2)+(y^2) and the planes z=1 and z=3 , so well i am struggling about the limits of each integral. I know that I can use cylindrical coordinates, but

asked by Alice on August 27, 2017
7. ### English

1. She lives there by herself. 2. She lives there by her. [Wich one is correct, #1 or #2?] 3. She has no money with herself. 4. She has no money with her. [Wich one is correct, #3 or #4?]

asked by rfvv on June 27, 2018
8. ### science

i need ti find a type of scentists that start with the letters j,w,and y help me? Is that three scientists: one starting with j, one with w, and one with y OR one scientist with Jwr????? wich is the largest see wich is the largest

asked by mallory on September 13, 2006
9. ### Math check

While writing an article on the high cost of college education, a reporter took a random sample of the cost of new textbooks for a semester. The random variable x is the cost of one book. Her sample data can be summarized by the

asked by TOM95 on June 19, 2013
10. ### statistics

A multiple choice test has 20 questions with each having 4 possible answers with one correct. Assume a student randomly guesses the answer to every question. 1) What is the probability of getting exactly 9 correct answers? 2)What