Find C + |C| : GMAT Data Sufficiency (DS)
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# Find C + |C|

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17 Sep 2010, 04:51
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Question Stats:

57% (01:52) correct 43% (00:40) wrong based on 191 sessions

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Find C + |C|

(1) |C|=1
(2) $$C^2= \sqrt{C}$$
[Reveal] Spoiler: OA
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Re: Find C + |C| [#permalink]

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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

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Re: Find C + |C| [#permalink]

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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
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Re: Find C + |C| [#permalink]

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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
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Re: Find C + |C| [#permalink]

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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......
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Re: Find C + |C| [#permalink]

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01 Mar 2015, 13:56
Hello from the GMAT Club BumpBot!

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Re: Find C + |C| [#permalink]

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01 Mar 2015, 14:29
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.

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Rich
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Re: Find C + |C| [#permalink]

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23 Jun 2016, 22:44
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).

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Re: Find C + |C|   [#permalink] 23 Jun 2016, 22:44
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