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

It is currently 28 Jul 2015, 00:43
GMAT Club Tests

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

Find C + |C|

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Manager
Manager
avatar
Joined: 16 Mar 2010
Posts: 190
Followers: 2

Kudos [?]: 74 [0], given: 9

Find C + |C| [#permalink] New post 17 Sep 2010, 04:51
1
This post was
BOOKMARKED
00:00
A
B
C
D
E

Difficulty:

  45% (medium)

Question Stats:

52% (01:51) correct 48% (00:31) wrong based on 47 sessions
Find C + |C|

(1) |C|=1
(2) \(C^2= \sqrt{C}\)
[Reveal] Spoiler: OA
Retired Moderator
User avatar
Joined: 02 Sep 2010
Posts: 805
Location: London
Followers: 84

Kudos [?]: 614 [0], given: 25

GMAT ToolKit User Reviews Badge
Re: Find C + |C| [#permalink] New post 17 Sep 2010, 04:54
amitjash wrote:
Find C+|C|
1. |C|=1
2. C^2= Sqrt C


(1) |C|=1 means C is 1 or -1. Not sufficient

(2) C^2 = sqrt(C) means either C=0 or C=1. not sufficient

(1)+(2) => C=1. Sufficient

Answer is (c)
_________________

Math write-ups
1) Algebra-101 2) Sequences 3) Set combinatorics 4) 3-D geometry

My GMAT story

GMAT Club Premium Membership - big benefits and savings

Manager
Manager
avatar
Joined: 19 Apr 2010
Posts: 212
Schools: ISB, HEC, Said
Followers: 4

Kudos [?]: 40 [0], given: 28

Re: Find C + |C| [#permalink] New post 21 Sep 2010, 05:16
I think the point here people likely to mis is C can be zero. As it happened in my case.
These mistakes can be very costly in GMAT.
Nice question thanks for posting
Director
Director
User avatar
Joined: 07 Jun 2004
Posts: 614
Location: PA
Followers: 3

Kudos [?]: 328 [0], given: 22

Re: Find C + |C| [#permalink] New post 21 Sep 2010, 07:30
I went with this explnation

S1 c can be -1 or 1 not sufficent

S2 c ^2 = sqrt( c) square both sides C ^ 4 = c or c ( c^3 - 1 ) = 0

c = 0 or c = 1 not sufficient

S1 and S2 we can say c = 1
_________________

If the Q jogged your mind do Kudos me : )

Senior Manager
Senior Manager
avatar
Joined: 20 Jul 2010
Posts: 270
Followers: 2

Kudos [?]: 49 [0], given: 9

GMAT ToolKit User Reviews Badge
Re: Find C + |C| [#permalink] New post 21 Sep 2010, 09:57
prashantbacchewar wrote:
I think the point here people likely to mis is C can be zero. As it happened in my case.
These mistakes can be very costly in GMAT.
Nice question thanks for posting



I missed 0 too......ha silly me......
_________________

If you like my post, consider giving me some KUDOS !!!!! Like you I need them

GMAT Club Legend
GMAT Club Legend
User avatar
Joined: 09 Sep 2013
Posts: 5662
Followers: 319

Kudos [?]: 61 [0], given: 0

Premium Member
Re: Find C + |C| [#permalink] New post 01 Mar 2015, 13:56
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
_________________

GMAT Books | GMAT Club Tests | Best Prices on GMAT Courses | GMAT Mobile App | Math Resources | Verbal Resources

Expert Post
EMPOWERgmat Instructor
User avatar
Status: GMAT Assassin/Co-Founder
Affiliations: EMPOWERgmat
Joined: 19 Dec 2014
Posts: 3000
Location: United States (CA)
GMAT 1: 800 Q51 V49
GRE 1: 340 Q170 V170
Followers: 130

Kudos [?]: 835 [0], given: 53

Re: Find C + |C| [#permalink] New post 01 Mar 2015, 14:29
Expert's post
Hi All,

The others posters in this thread have properly solved the problem, so I won't rehash any of that work here. Instead, I want to point out some details on the "nature" of DS questions. DS questions are on the GMAT to test you on a variety of skills that are not strictly "math skills": organization, accuracy, attention-to-detail, thoroughness, the ability to PROVE that you're correct, etc.

Every DS question has AT LEAST one answer. Part of your job when facing any DS question is to look "beyond" the obvious. To get the points, you have to show how thorough your thinking is by finding the alternatives (if they exist).

In Fact 2, I'm sure that almost everyone would think "oh, it has to be the number 1...."; if those same Test Takers don't do the necessary extra work to realize that 0 is ALSO a possible answer, then those same people will get this easy question wrong, lose out on those points and not even know it. Get in the habit of thinking - do work, take notes, consider the possibilities and you'd be amazed how easy most DS questions actually are.

GMAT assassins aren't born, they're made,
Rich
_________________

Official Guide 2016 Question Breakdown:
http://gmatclub.com/forum/empowergmat-blog-198415.html#p1527977

Rich Cohen
Rich.C@empowergmat.com
http://www.empowergmat.com

GMAT Club Verified Reviews for EMPOWERgmat & Special Discount

EMPOWERgmat Podcast - A Wild Secret About The GMAT Algorithm


Re: Find C + |C|   [#permalink] 01 Mar 2015, 14:29
    Similar topics Author Replies Last post
Similar
Topics:
3 Experts publish their posts in the topic If c is an integer and c > 0, is c a root of the equation LM 10 24 Oct 2012, 03:52
18 Experts publish their posts in the topic Is a > c? rphardu 13 13 Aug 2012, 11:06
5 Experts publish their posts in the topic If # represents +, -, *, or /, then does (a+b)#c = (a#c) + (b#c) for a JenniferClopton 13 29 Nov 2010, 21:09
12 Experts publish their posts in the topic If c and d are integers, is c even? zaarathelab 19 30 Jan 2010, 12:15
10 Experts publish their posts in the topic If c and d are integers, is c even? tarek99 9 25 Jul 2008, 01:50
Display posts from previous: Sort by

Find C + |C|

  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®.