Find all School-related info fast with the new School-Specific MBA Forum

It is currently 01 Oct 2014, 06:38

Close

GMAT Club Daily Prep

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.

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

help in solving this quant ques ??

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
Intern
Intern
avatar
Joined: 02 Nov 2012
Posts: 2
Followers: 0

Kudos [?]: 0 [0], given: 0

help in solving this quant ques ?? [#permalink] New post 02 Nov 2012, 09:19
A number is chosen at random from the set of integers that satisfy |x| < p What is the probability that 4/x > x?

A. 7/17

B. 1/5

C. 7/8

D. 1/8

E. None of these
Expert Post
Magoosh GMAT Instructor
User avatar
Joined: 28 Dec 2011
Posts: 2101
Followers: 522

Kudos [?]: 2164 [0], given: 31

Re: help in solving this quant ques ?? [#permalink] New post 02 Nov 2012, 10:37
Expert's post
vjvk wrote:
A number is chosen at random from the set of integers that satisfy |x| < p What is the probability that 4/x > x?
A. 7/17
B. 1/5
C. 7/8
D. 1/8
E. None of these

I would be happy to help with this question, but there's something funky. What is p?? By "p", do you mean "pi" (i.e. 3.1415926)? Of course, p can't be the probability, because that would be less than one, which would limit x to the integer zero, which gives an undefined answer to the inequality. Also, that would be a very bizarre self-referential question considerably more sophisticated than something the GMAT would ask.

It seems that answering this question depends on knowing something about p. I would say that you haven't given us all the information needed to solve the question.

Provide the rest of the information, and I will be happy to help you.

Mike :-)
_________________

Mike McGarry
Magoosh Test Prep

Image

Image

Intern
Intern
avatar
Joined: 02 Nov 2012
Posts: 2
Followers: 0

Kudos [?]: 0 [0], given: 0

Re: help in solving this quant ques ?? [#permalink] New post 02 Nov 2012, 21:39
Mike

I got this question from the JumboTest

i checked question again . I had missed out "x" in my question .

i have attached the question .

thanks
vjvk
Attachments

jumbotest.PNG
jumbotest.PNG [ 11.47 KiB | Viewed 357 times ]

Expert Post
Magoosh GMAT Instructor
User avatar
Joined: 28 Dec 2011
Posts: 2101
Followers: 522

Kudos [?]: 2164 [0], given: 31

Re: help in solving this quant ques ?? [#permalink] New post 03 Nov 2012, 12:50
Expert's post
vjvk wrote:
Mike

I got this question from the JumboTest

i checked question again . I had missed out "x" in my question .

i have attached the question .

thanks
vjvk

OK, first of all, this is in no way a realistic GMAT question. The GMAT would never ask this question.

It seems that we are able to make any choice we want for P ---- if the question has a meaningful numerical answer, that answer should be independent of the choice of P.

If P is zero or anything less than zero, there are not possible values of x, so there's no set to consider at all.

If P = 1, the only value in the set would be x = 0, and it violates the mathematical law to plug this in ---- so the probability is zero that we could plug a member in, and the inequality would true.

If P = 2, then the set consists of {-1, 0, 1}
When x = -1, 4/(-1) = -4 is less than -1, so the inequality is false
When x = 0, the inequality is meaningless
When x = 1, 4/1 = 4 > 1, and the inequality is true.
The probability that a value in this set makes the inequality true is 1/3

Let's jump to P = 4. Then, the set consists of {-3, -2, -1, 0, 1, 2, 3}
When x = -3, then (-4/3) is greater than (-3), and the inequality is true
When x = -2, then -2 = -2, and the inequality is false
When x = -1, 4/(-1) = -4 is less than -1, so the inequality is false
When x = 0, the inequality is meaningless
When x = 1, 4/1 = 4 > 1, and the inequality is true.
When x = 2, then 2 = 2, and the inequality is false.
When x = 3, then 4/3 is less than 3, so the inequality is false.
The probability that a value in this set makes the inequality true is 2/7

What we have found is that if we pick different values of P, the question itself takes on different answers. This means, if P is unspecified, there is no meaningful answer to the question, so E would be the best response.

I am not terribly familiar with JumboTest, but judging from this question, I think you need to find a much higher quality source of GMAT prep material.

Does all this make sense?

Mike :-)
_________________

Mike McGarry
Magoosh Test Prep

Image

Image

Re: help in solving this quant ques ??   [#permalink] 03 Nov 2012, 12:50
    Similar topics Author Replies Last post
Similar
Topics:
Need help solving 2 quant questions rtaha2412 6 27 Sep 2010, 22:17
2 PLEASE help me solve this ques silpajorna 7 09 Sep 2010, 01:26
Problem Solving ques - Divisibility nikhilbansal123 3 30 Jul 2007, 04:05
Problem Solving ques nikhilbansal123 4 30 Jul 2007, 03:54
Quant Questions-please help me solve these nitinneha 8 18 Mar 2007, 18:04
Display posts from previous: Sort by

help in solving this quant ques ??

  Question banks Downloads My Bookmarks Reviews Important topics  


GMAT Club MBA Forum Home| About| Privacy Policy| Terms and Conditions| GMAT Club Rules| Contact| Sitemap

Powered by phpBB © phpBB Group and phpBB SEO

Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.