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# Does both options in a DS question provide th same answer ?

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Does both options in a DS question provide th same answer ? [#permalink]  15 Jul 2012, 20:01
Hi

I might be asking a stupid question but then i couldn't stop myself from asking it.

Suppose a DS question asks you to find an answer. Lets assume they ask you to find the median of a certain data set with variables in it.
based on the two options you have to determine if median >= 5 or not ?

If both the option of the question are able to solve it, is it necessary that both questions should get you the same result ?

For ex if option A gets the result as median = 5 is it necessary that if option B also is able to get the right answer then it should also get the median value as 5 ??

can there be a possibility that option B gets an answer different than 5 ?

Thanks
smartmanav

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Re: Does both options in a DS question provide th same answer ? [#permalink]  16 Jul 2012, 03:16
Hi,

As far as I think GMAT "might" not give you any such question inw hich both Stat1 and Sta2 are giving you different answers individually.
If i get a question like this then i will still be going and marking option "D" and not option "E"
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Re: Does both options in a DS question provide th same answer ? [#permalink]  16 Jul 2012, 04:21
Expert's post
smartmanav wrote:
Hi

I might be asking a stupid question but then i couldn't stop myself from asking it.

Suppose a DS question asks you to find an answer. Lets assume they ask you to find the median of a certain data set with variables in it.
based on the two options you have to determine if median >= 5 or not ?

If both the option of the question are able to solve it, is it necessary that both questions should get you the same result ?

For ex if option A gets the result as median = 5 is it necessary that if option B also is able to get the right answer then it should also get the median value as 5 ??

can there be a possibility that option B gets an answer different than 5 ?

Thanks
smartmanav

Ask a question be a fool for 3 minutes, don't ask n b a fool all your life !!

No, scenario you describe is not possible, since on the GMAT, two data sufficiency statements always provide TRUE information and these statements never contradict each other.

So, for example in an YES/NO DS question you cannot have a NO answer from the first statement and an YES answer from the second statement or if you are asked to find the value of x, then you cannot get x=5 from the first statement and x=4 from the second statement.

Hope it helps.
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Does both options in a DS question provide th same answer ? [#permalink]  21 Jul 2015, 06:04
Hi,

So in that case, If I arrived at different solutions for the same DS question, Can we say I went wrong somewhere and need to recheck my calculations???

This can actually help in confirming a particular DS question, given that Number proporties (like odd/even) are pretty tricky.

Thanks
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Re: Does both options in a DS question provide th same answer ? [#permalink]  21 Jul 2015, 06:17
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amritrungta wrote:
Hi,

So in that case, If I arrived at different solutions for the same DS question, Can we say I went wrong somewhere and need to recheck my calculations???

This can actually help in confirming a particular DS question, given that Number proporties (like odd/even) are pretty tricky.

Thanks

Yes, if you got x = 1 from (1) and x = 2 from (2), then this should be an indication that somewhere you made a mistake.
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Re: Does both options in a DS question provide th same answer ? [#permalink]  21 Jul 2015, 06:28
Bunuel wrote:
smartmanav wrote:
Hi

I might be asking a stupid question but then i couldn't stop myself from asking it.

Suppose a DS question asks you to find an answer. Lets assume they ask you to find the median of a certain data set with variables in it.
based on the two options you have to determine if median >= 5 or not ?

If both the option of the question are able to solve it, is it necessary that both questions should get you the same result ?

For ex if option A gets the result as median = 5 is it necessary that if option B also is able to get the right answer then it should also get the median value as 5 ??

can there be a possibility that option B gets an answer different than 5 ?

Thanks
smartmanav

Ask a question be a fool for 3 minutes, don't ask n b a fool all your life !!

No, scenario you describe is not possible, since on the GMAT, two data sufficiency statements always provide TRUE information and these statements never contradict each other.

So, for example in an YES/NO DS question you cannot have a NO answer from the first statement and an YES answer from the second statement or if you are asked to find the value of x, then you cannot get x=5 from the first statement and x=4 from the second statement.

Hope it helps.

Bunuel, this is a very interesting observation you have mentioned. But I have seen in some yes/no DS questions to provide a "no" for 1 statement and "yes" for the other statement and as both statements still give an unambiguous yes or no , the correct answer happens to be D.
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Re: Does both options in a DS question provide th same answer ? [#permalink]  21 Jul 2015, 06:51
Thanks a lot !!!
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Re: Does both options in a DS question provide th same answer ? [#permalink]  21 Jul 2015, 06:52
Expert's post
Engr2012 wrote:
Bunuel wrote:
smartmanav wrote:
Hi

I might be asking a stupid question but then i couldn't stop myself from asking it.

Suppose a DS question asks you to find an answer. Lets assume they ask you to find the median of a certain data set with variables in it.
based on the two options you have to determine if median >= 5 or not ?

If both the option of the question are able to solve it, is it necessary that both questions should get you the same result ?

For ex if option A gets the result as median = 5 is it necessary that if option B also is able to get the right answer then it should also get the median value as 5 ??

can there be a possibility that option B gets an answer different than 5 ?

Thanks
smartmanav

Ask a question be a fool for 3 minutes, don't ask n b a fool all your life !!

No, scenario you describe is not possible, since on the GMAT, two data sufficiency statements always provide TRUE information and these statements never contradict each other.

So, for example in an YES/NO DS question you cannot have a NO answer from the first statement and an YES answer from the second statement or if you are asked to find the value of x, then you cannot get x=5 from the first statement and x=4 from the second statement.

Hope it helps.

Bunuel, this is a very interesting observation you have mentioned. But I have seen in some yes/no DS questions to provide a "no" for 1 statement and "yes" for the other statement and as both statements still give an unambiguous yes or no , the correct answer happens to be D.

Such kind of DS questions would be considered flawed as per GMAT standards.
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Re: Does both options in a DS question provide th same answer ? [#permalink]  22 Jul 2015, 19:35
amritrungta

Here are some tacit rules that are followed by GMAT test writers when it comes to Data Sufficiency:

1) The two statements in data sufficiency will never contradict each other.

2) If each statement alone is sufficient, then the outcome will be consistent. This means that if it is a Yes/No data sufficiency question, then both statement will answer the question in the main stem as Yes, or both will answer them as No. If it is a value question, then the outcome will be identical in both cases.

3) If you find that your outcome to the question is different for both the statements, while each statement is sufficient, then you can be guaranteed that either you made some computational error in a value question or you are misinterpreting the statements. This is a valuable tool and I use it to gain further confidence that I did indeed get the data sufficiency question right.

Cheers,
Dabral
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Re: Does both options in a DS question provide th same answer ? [#permalink]  22 Jul 2015, 19:36
Expert's post
Hi All,

Some of the 'language' in this discussion might be misinterpreted, so I'm going to add some clarification to the discussion.

In DS questions, the two Facts CANNOT BOTH be Sufficient with different answers. If you come across this type of situation in a DS question, then the likely reason for it is that your work is INCOMPLETE (so you didn't do enough to prove that one of the Facts was actually Insufficient).

Here's a simple example:

X is an integer. Is X greater than 0?

1) -3 < X < 0

In this Fact, there are a couple of possible values for X....
IF....
X = -1, then the answer to the question is NO
X = -2, then the answer to the question is NO
The answer is ALWAYS NO, so....
Fact 1 is SUFFICIENT

2) X^2 = 4

In this Fact, there are a coupe of possible values for X....
IF....
X = 2, then the answer to the question is YES
X = -2, then the answer to the question is NO
Fact 2 is INSUFFICIENT

In this situation, if your work was 'incomplete' in Fact 2 (and you thought that X = 2 was the only solution), then you might think that it's SUFFICIENT (but it's actually NOT - there's another possible value for X that leads to a different answer to the question).

Hi Engr2012,

If you can 'dig up' any DS questions that match what you describe, then you should post them here. It's possible that the question wasn't properly 'designed' or it's possible that you might have missed something when you attempted to solve it.

GMAT assassins aren't born, they're made,
Rich
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Re: Does both options in a DS question provide th same answer ? [#permalink]  29 Jul 2015, 21:11
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amritrungta wrote:
Hi,

So in that case, If I arrived at different solutions for the same DS question, Can we say I went wrong somewhere and need to recheck my calculations???

This can actually help in confirming a particular DS question, given that Number proporties (like odd/even) are pretty tricky.

Thanks

Absolutely! The two statements will not contradict so if you get different answers, you must recheck your logic/calculations.
In fact, I have discussed an advanced DS strategy based on this property of GMAT DS questions here: http://www.veritasprep.com/blog/2014/07 ... t-part-ii/
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Re: Does both options in a DS question provide th same answer ?   [#permalink] 29 Jul 2015, 21:11
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# Does both options in a DS question provide th same answer ?

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