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Probalility

by shilpaqueen » Sun Nov 21, 2010 9:43 am
Find the probalility that n divisible by 9?

1.n is a multiple of 3
2.n is a multiple 27



What would be the correct answere and why?
In data sufficency both the statements should give the same answer right? Here the probality in both the satements seems differnt..right?

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by shovan85 » Sun Nov 21, 2010 10:00 am
shilpaqueen wrote:Find the probalility that n divisible by 9?

1.n is a multiple of 3
2.n is a multiple of 27
1. If n is a multiple of 3 then n can be 3,6,9,12,15,18,.... So in every 3 occurence once it will be div by 9

Thus 1/3 (Sufficient)

2. If n is a multiple of 27 then n is bound to be div by 9

Thus 1 (Sufficient)
shilpaqueen wrote: What would be the correct answere and why?
Thus answer will be D. Because both options are individually sufficient to answer the question.
shilpaqueen wrote: In data sufficency both the statements should give the same answer right? Here the probality in both the satements seems differnt..right?
Not necessarily. When you are considering an option you have to forget the existence of the other. You have to get the same answer only when you have to consider both options simultaneously (for option C or E)
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by Laura GMAT Tutor » Fri Nov 26, 2010 11:40 am
This is a very unusual problem. I've never seen anything like it in the official guide (dating all the way back to OG edition 9), the powerpreps, or any real GMAT I've taken.

Where did you find it?
follow me on twitter! :)
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or visit my blog:
https://realusefulgmat.blogspot.com/

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by rishab1988 » Fri Nov 26, 2010 12:21 pm
Laura you are correct in pointing out this is not a GMAT like Q.I have noticed that many people post questions on verbal and quant which are un-GMAT like.

In-fact I have seen that some people post SC questions in which even the non-underlined part is wrong.Same case with CR. According to me,everyone should first credibility of those sources of those questions.It is very likely that those questions in themselves maybe wrong.

I think doing MGMAT CAT quant is the highest level you should aim for in quant.But some people,especially Indians,draw questions from a much tougher exam CAT (Common Admission Test) conducted by IIM's.There is no point in doing those questions because those questions are tougher than GMAT or for that matter any american exam are designed in such a way that the cut-off are as low as possible. For eg getting 60% right on CAT will land you in 95-99 percentile bracket,unlike in GMAT.

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by goyalsau » Fri Nov 26, 2010 8:21 pm
shovan85 wrote: Not necessarily. When you are considering an option you have to forget the existence of the other. You have to get the same answer only when you have to consider both options simultaneously (for option C or E)
Shovan in Gmat it is always, always , always, That two statements should not contradict each other, It does not matter whether the answer of the question is C or E, or A or B,

Both statements should always give the same answer,,,,,,,
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by beat_gmat_09 » Fri Nov 26, 2010 8:25 pm
goyalsau wrote:
shovan85 wrote: Not necessarily. When you are considering an option you have to forget the existence of the other. You have to get the same answer only when you have to consider both options simultaneously (for option C or E)
Shovan in Gmat it is always, always , always, That two statements should not contradict each other, It does not matter whether the answer of the question is C or E, or A or B,

Both statements should always give the same answer,,,,,,,
I agree with goyalsau.
Both option answers should give the same answer if they're sufficient.
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by shovan85 » Fri Nov 26, 2010 11:15 pm
HI Sourabh and beat_gmat_09,

How does it matter? If the answers do not match also what will be the answer according to you ;)

If the answers are matching then only will it be D? Is it so? How do you know this please let me know.

Where has it been mentioned? Please this will be of real help.

I agree that I have never seen such two different answers from both options but both options individually are sufficient.

Experts may opine please.

Thanks,
Shovan
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by beat_gmat_09 » Sat Nov 27, 2010 12:44 am
shovan85 wrote:HI Sourabh and beat_gmat_09,

How does it matter? If the answers do not match also what will be the answer according to you ;)

If the answers are matching then only will it be D? Is it so? How do you know this please let me know.

Where has it been mentioned? Please this will be of real help.

I agree that I have never seen such two different answers from both options but both options individually are sufficient.

Experts may opine please.

Thanks,
Shovan
Hi Shovan,
I digged this very hard for you, this is what i found. These articles need to be archived by year and month, i'm putting a suggestion for this one.

Check this link -
https://www.beatthegmat.com/mba/2010/04/ ... he-overlap

Hope this helps.
P.S. - Don't forget to check the comments.

Thanks,
Nikhil
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by selango » Sat Nov 27, 2010 1:18 am
Shovan,

As others pointed out,in GMAT its highly impossible to get a question like this.

If question ask us to solve value of single variable or inequality condition or probability,please note that the value in both the statements never contradicts each other.To say in other words it must be equal in both statements if both statements are sufficient.

For example,check the below problem [It's wont appear in GMAT]

is x>10?

stmt1,

x<5

Sufficient

stmt2,

x>11

Sufficient

As you can see both statements are sufficient.But if v check the condition it ll be like x<5 and x>11.

Is this possible?No.

Id the answer is D,then

1.The value of any variable matches in both statements.

2.The inequality condition ll be correct and wont contradict each other.


shilpaqueen,

Please cite the source of this question.Always use the authentic GMAT material.
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by shovan85 » Sat Nov 27, 2010 1:27 am
beat_gmat_09 wrote:
shovan85 wrote:HI Sourabh and beat_gmat_09,

How does it matter? If the answers do not match also what will be the answer according to you ;)

If the answers are matching then only will it be D? Is it so? How do you know this please let me know.

Where has it been mentioned? Please this will be of real help.

I agree that I have never seen such two different answers from both options but both options individually are sufficient.

Experts may opine please.

Thanks,
Shovan
Hi Shovan,
I digged this very hard for you, this is what i found. These articles need to be archived by year and month, i'm putting a suggestion for this one.

Check this link -
https://www.beatthegmat.com/mba/2010/04/ ... he-overlap

Hope this helps.
P.S. - Don't forget to check the comments.

Thanks,
Nikhil
Thanks man. Arising this situation is highly unlikely :)

Thanks again :)
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by goyalsau » Sat Nov 27, 2010 2:52 am
beat_gmat_09 wrote:
shovan85 wrote:HI Sourabh and beat_gmat_09,

How does it matter? If the answers do not match also what will be the answer according to you ;)

If the answers are matching then only will it be D? Is it so? How do you know this please let me know.

Where has it been mentioned? Please this will be of real help.

I agree that I have never seen such two different answers from both options but both options individually are sufficient.

Experts may opine please.

Thanks,
Shovan
Good work Brother,,,

Hi Shovan,
I digged this very hard for you, this is what i found. These articles need to be archived by year and month, i'm putting a suggestion for this one.

Check this link -
https://www.beatthegmat.com/mba/2010/04/ ... he-overlap

Hope this helps.
P.S. - Don't forget to check the comments.

Thanks,
Nikhil
Saurabh Goyal
talk_to_saurabh@yahoo.com
-------------------------


EveryBody Wants to Win But Nobody wants to prepare for Win.