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is a=0 ? (1) a=0; (2) a=1;

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wudy
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is a=0 ? (1) a=0; (2) a=1; [#permalink] New post   06 Jul 2007, 18:47
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DS: is a=0 ?
(1) a=0;
(2) a=1;

My answer is A, however, my friend said the answer should be D. Her explanation is that, if a=1, then is sufficient to conclude that 'a=0' is incorrect.

I checked the definition in OG, but I still do not understand...

So please tell me. Is A or D, and why?



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Where to now? Join ongoing discussions on thousands of quality questions in our Data Sufficiency (DS) Forum
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salr15
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Re: is a=0 ? (1) a=0; (2) a=1; [#permalink] New post   06 Jul 2007, 19:43
wudy wrote:
DS: is a=0 ?
(1) a=0;
(2) a=1;

My answer is A, however, my friend said the answer should be D. Her explanation is that, if a=1, then is sufficient to conclude that 'a=0' is incorrect.

I checked the definition in OG, but I still do not understand...

So please tell me. Is A or D, and why?


I would also agree with D. These type of "is" questions or Yes/No questions, it can only be insufficient if it is ambiguous. From what you have given us, both answers are definite, 1 being Yes and 2 being No. Unless there is something missing?
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Re: is a=0 ? (1) a=0; (2) a=1; [#permalink] New post   06 Jul 2007, 21:12
salr15 wrote:
wudy wrote:
DS: is a=0 ?
(1) a=0;
(2) a=1;

My answer is A, however, my friend said the answer should be D. Her explanation is that, if a=1, then is sufficient to conclude that 'a=0' is incorrect.

I checked the definition in OG, but I still do not understand...

So please tell me. Is A or D, and why?


I would also agree with D. These type of "is" questions or Yes/No questions, it can only be insufficient if it is ambiguous. From what you have given us, both answers are definite, 1 being Yes and 2 being No. Unless there is something missing?


I made the question to simplify the view. DS like this looks so weird, since I did not get it. :oops:
Thank you salr15.
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Himalayan
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Re: is a=0 ? (1) a=0; (2) a=1; [#permalink] New post   06 Jul 2007, 22:43
wudy wrote:
DS: is a=0 ?
(1) a=0;
(2) a=1;

My answer is A, however, my friend said the answer should be D. Her explanation is that, if a=1, then is sufficient to conclude that 'a=0' is incorrect.

I checked the definition in OG, but I still do not understand...

So please tell me. Is A or D, and why?


its D but the question is poor. in DS question you wont get questions with different answers though each statement is sufficient.

1: a = 0. so suff.
2: a = 1. also suff.

from 1&2 above, a = 0 and 1. a has two answers, which is not possible in gmat DS.
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Re: is a=0 ? (1) a=0; (2) a=1; [#permalink] New post   06 Jul 2007, 23:16
Himalayan wrote:
wudy wrote:
DS: is a=0 ?
(1) a=0;
(2) a=1;

My answer is A, however, my friend said the answer should be D. Her explanation is that, if a=1, then is sufficient to conclude that 'a=0' is incorrect.

I checked the definition in OG, but I still do not understand...

So please tell me. Is A or D, and why?


its D but the question is poor. in DS question you wont get questions with different answers though each statement is sufficient.

1: a = 0. so suff.
2: a = 1. also suff.

from 1&2 above, a = 0 and 1. a has two answers, which is not possible in gmat DS.


Agree with Himalayan, its a poorly written question. Not GMAT style.

:?
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ian7777
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Re: is a=0 ? (1) a=0; (2) a=1; [#permalink] New post   07 Jul 2007, 10:07
KillerSquirrel wrote:
Himalayan wrote:
wudy wrote:
DS: is a=0 ?
(1) a=0;
(2) a=1;

My answer is A, however, my friend said the answer should be D. Her explanation is that, if a=1, then is sufficient to conclude that 'a=0' is incorrect.

I checked the definition in OG, but I still do not understand...

So please tell me. Is A or D, and why?


its D but the question is poor. in DS question you wont get questions with different answers though each statement is sufficient.

1: a = 0. so suff.
2: a = 1. also suff.

from 1&2 above, a = 0 and 1. a has two answers, which is not possible in gmat DS.


Agree with Himalayan, its a poorly written question. Not GMAT style.

:?


DEFINITELY not. You will NEVER see a question where the two statements come out to different solutions. Think carefully about that as you do real problems from the OG or other sources. You will notice the pattern if you're looking out for it.
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wudy
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Re: is a=0 ? (1) a=0; (2) a=1; [#permalink] New post   09 Jul 2007, 05:36
Thank you guys.

I just finished GMAT test yesterday: PS 51, Verbal 35, Score 710.

Luckly, I had asked this question before the test, because I met an exectly same type of question. According to the score, all of you are right.

Thanks & regard.
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ian7777
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Re: is a=0 ? (1) a=0; (2) a=1; [#permalink] New post   09 Jul 2007, 06:11
wudy wrote:
Thank you guys.

I just finished GMAT test yesterday: PS 51, Verbal 35, Score 710.

Luckly, I had asked this question before the test, because I met an exectly same type of question. According to the score, all of you are right.

Thanks & regard.


CONGRATULATIONS! That's a GREAT score.

Can you go into more detail a little about the type of question you got? I'm curious how it looked. You don't have to repeat the question - that's obviously not allowed - but how it related to this post.

Nice work on the math. That's great.
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Re: is a=0 ? (1) a=0; (2) a=1; [#permalink] New post   09 Jul 2007, 06:38
ian7777 wrote:
wudy wrote:
Thank you guys.

I just finished GMAT test yesterday: PS 51, Verbal 35, Score 710.

Luckly, I had asked this question before the test, because I met an exectly same type of question. According to the score, all of you are right.

Thanks & regard.


CONGRATULATIONS! That's a GREAT score.

Can you go into more detail a little about the type of question you got? I'm curious how it looked. You don't have to repeat the question - that's obviously not allowed - but how it related to this post.

Nice work on the math. That's great.


Find a similar question here:
https://www.gmatclub.com/phpbb/viewtopic.php?p=341470.

In addition, my experience for math:
(1) 2 minutes for 1 question is long enough to calculate the question twice; if I can, do it in a different way again.
(2) Pay 100% attention to the end of the question, GMAT usually does not ask what you expected.
(3) I shall make mistake if I do not understand the question well.



Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Data Sufficiency (DS) Forum
Still interested in this question? Check out the "Best Topics" block above for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!
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Re: is a=0 ? (1) a=0; (2) a=1; [#permalink]
09 Jul 2007, 06:38
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