Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized for You

we will pick new questions that match your level based on your Timer History

Track Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice Pays

we will pick new questions that match your level based on your Timer History

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

It appears that you are browsing the GMAT Club forum unregistered!

Signing up is free, quick, and confidential.
Join other 350,000 members and get the full benefits of GMAT Club

Registration gives you:

Tests

Take 11 tests and quizzes from GMAT Club and leading GMAT prep companies such as Manhattan GMAT,
Knewton, and others. All are free for GMAT Club members.

Applicant Stats

View detailed applicant stats such as GPA, GMAT score, work experience, location, application
status, and more

Books/Downloads

Download thousands of study notes,
question collections, GMAT Club’s
Grammar and Math books.
All are free!

Thank you for using the timer!
We noticed you are actually not timing your practice. Click the START button first next time you use the timer.
There are many benefits to timing your practice, including:

Re: M03 DS Question [#permalink]
09 Dec 2008, 22:04

5

This post received KUDOS

topmbaseeker wrote:

Is N^x even?

1. N is even 2. x^2-3x+2 = 0

(C) 2008 GMAT Club - m03#24

* Statement (1) ALONE is sufficient, but Statement (2) ALONE is not sufficient * Statement (2) ALONE is sufficient, but Statement (1) ALONE is not sufficient * BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient * EACH statement ALONE is sufficient * Statements (1) and (2) TOGETHER are NOT sufficient

has to be C.

1: n = lets say 2 but x could be -1, 0, 0.5, 2. Then in all cases, n^x is not an even. so nsff.. 2: x = 1 or 2 but what is n? nsf.

This question reminds us the importance of fraction, negatives and zero. I lost out on my previous GMAT cuz of this, so now before freezing on the answer for variables in question always remember frazen(fractions, zero and negatives)

Hi, C is the correct option because even if N is even N^x can be odd. Consider for example N = 4 N^0 = 4^0 =1 which is odd If we consider the second statement then we come to know that x can be either 1 or 2. So from 1 and 2 both we can answer the question properly hence the solution for this is C.

How did you get x=1 or X=2 from x2 -3X+2 = 0. Just from trying figures starting from 0 or can the equation be written in a way that makes it solution obvious ?

How did you get x=1 or X=2 from x2 -3X+2 = 0. Just from trying figures starting from 0 or can the equation be written in a way that makes it solution obvious ?

Hi, You need to know the basics of quadratic equation to solve. Try searching for Crammers Rule.

I chose (A) at first as well. We don't know whether X is an integer or not, that made sense for me. So the correct answer is (C) as far as we learn that N is a positive integer.

The answer is the first option. An even number raised to any number is always even. However, for the quadratic equation, x=1,2. And it cannot be certainly be told if N^x is even without knowing the value of N.

Statement 1: Insufficient. x could be 1 or x could be 0. Statement 2: Insufficient. After factoring x = 2 or x = 1. We also do not know anything about N.

Combined 1 + 2. We know that N is even. An even number raised to either 1 or 2 would still be EVEN. Sufficient. C.

N^x will must be even if a) N is even & b) x is non negative & non zero

i) Says N is even but doesn't say abt x ii) Gives x as 1 or , but doesn't say abt N combining both we get N even & x 1 or 2 so N^x must be even.. Hence 'C'