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by Ajitpal Sian » Fri Nov 04, 2011 12:48 am
If 'n' is a positive integer then what is the possible value of the mode 7n-56.

Options are:
(1)7
(2)9
(3)21
(4)16
(5)13

Plz find me the solution for it..
I m stuck with tweo answer choices i.e (1) and (3)...Which should i choose between these two??
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Source: — Data Sufficiency |
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by satishchandra » Fri Nov 04, 2011 1:49 am
I would do the prob this way.
7n-56= 7(n-8)

As per the definition, 'n' is possitive integer.
So 7n-56 has to be a value, which must be multiple of 7.

9, 16, 16 can not be the values of 7(n-8) if 'n' is a possitive integer.

However, If 'n' is fraction, any value can be possible

Where did you find this question?
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by vaibhavgupta » Fri Nov 04, 2011 1:57 am
Ajitpal Sian wrote:If 'n' is a positive integer then what is the possible value of the mode 7n-56.

Options are:
(1)7
(2)9
(3)21
(4)16
(5)13

Plz find me the solution for it..
I m stuck with tweo answer choices i.e (1) and (3)...Which should i choose between these two??
First , Not a Data Sufficiency question

Second, both 7 And 21 are possible values.

think u got the question wrong!
If OA is A, IMO B
If OA is B, IMO C
If OA is C, IMO D
If OA is D, IMO E
If OA is E, IMO A

FML!! :/
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by Ajitpal Sian » Fri Nov 04, 2011 3:41 am
The question is taken from the official GMAT paper 2011.

So there r very few chances of the question being wrong!!!!

Any further help would be appreciated!!!!
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by Brent@GMATPrepNow » Fri Nov 04, 2011 5:36 am
Ajitpal Sian wrote:The question is taken from the official GMAT paper 2011.
Can you tell me more about this GMAT paper? I'm confused by the word "mode" here. It would make more sense for the question to read: If n is a positive integer, then what is the possible value of 7n-56.

From here, we can see that since 7n-56 = 7(n-8), the correct answer must be a multiple of 7. So, the answer could be either A or C

A) If n=9, then 7n-56 = 7
C) If n=11, then 7n-56 = 21

Given the 2 correct answers, it would be hard for this to be an official question.

Other tip-offs that this is not an official question:
- Answer choices listed as 1,2,3... (and not A,B,C..)
- Answer choices not listed in ascending order

Cheers,
Brent
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by vaibhavgupta » Fri Nov 04, 2011 5:45 am
Brent@GMATPrepNow wrote:
Ajitpal Sian wrote:The question is taken from the official GMAT paper 2011.
Can you tell me more about this GMAT paper? I'm confused by the word "mode" here. It would make more sense for the question to read: If n is a positive integer, then what is the possible value of 7n-56.

From here, we can see that since 7n-56 = 7(n-8), the correct answer must be a multiple of 7. So, the answer could be either A or C

A) If n=9, then 7n-56 = 7
C) If n=11, then 7n-56 = 21

Given the 2 correct answers, it would be hard for this to be an official question.


Exactly why i doubted this question
Other tip-offs that this is not an official question:
- Answer choices not listed in ascending order
Did not know this ! thanks! :)
If OA is A, IMO B
If OA is B, IMO C
If OA is C, IMO D
If OA is D, IMO E
If OA is E, IMO A

FML!! :/
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by Brent@GMATPrepNow » Fri Nov 04, 2011 5:53 am
Brent@GMATPrepNow wrote: - Answer choices not listed in ascending order
Oops, make that ". . . ascending or descending order".

Cheers,
Brent
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