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Is N + 2 > 8 ? 1. N is a positive integer less than 10.

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Is N + 2 > 8 ? 1. N is a positive integer less than 10. [#permalink] New post 28 Apr 2010, 18:55
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B
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Is N + 2 > 8 ?

1. N is a positive integer less than 10.
2. N is a one digit prime number.

[Reveal] Spoiler:
B


I want to know how B is correct?

because if N is a one digit prime it could be 2,3,5 or 7 right?..
if N = 2 or 3 or 5 then its - Insuff
if N = 7 - Suff
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Re: Is N + 2 > 8 ? [#permalink] New post 28 Apr 2010, 20:07
Just think that there are 3 statements given.

First one is N+2>8

Now consider the 3rd statement (originally the second one in question), that N is single digit prime number.

Now combine the above two statements, i.e 2 is added to which single digit prime number so that the resul is greater than 8.

Choice is obvious "7". Hence the answer is "B".
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Re: Is N + 2 > 8 ? [#permalink] New post 29 Apr 2010, 01:16
zz0vlb wrote:
Is N + 2 > 8 ?

1. N is a positive integer less than 10.
2. N is a one digit prime number.

[Reveal] Spoiler:
B


I want to know how B is correct?

because if N is a one digit prime it could be 2,3,5 or 7 right?..
if N = 2 or 3 or 5 then its - Insuff
if N = 7 - Suff


Some how i don't agree with OA.
Both statements are not enough.

Statement 1:

N is a positive integer less than 10.
N can be 1,2,3,4,5,6,7,8,9.

Is N + 2 > 8, if n is 7,8,9 then Yes..else No. INSUFFICIENT.

Statement 2:
N is a one digit prime number.
N can be 2,3,5,7. Is N + 2 > 8, if n is 7 then Yes..else No. INSUFFICIENT.

Both together:

n can be 2,3,5,7 and the answer to the question that "Is N + 2 > 8" is not clear..!!
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Re: Is N + 2 > 8 ? [#permalink] New post 29 Apr 2010, 02:25
Hussain15 wrote:
Just think that there are 3 statements given.

First one is N+2>8

Now consider the 3rd statement (originally the second one in question), that N is single digit prime number.

Now combine the above two statements, i.e 2 is added to which single digit prime number so that the resul is greater than 8.

Choice is obvious "7". Hence the answer is "B".


This is a wrong approach towards yes/no DS question.

If you can have multiple answers using the statements, => you cannot sufficiently answer the given question.

here if you take n =5 and n =7 you get answer as no and yes.

Hope this helps.
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Re: Is N + 2 > 8 ? [#permalink] New post 29 Apr 2010, 02:42
never really seen the approach Hussain15 has taken ...in my opinion absolutely wrong ....

how can u combine two statements and then in the end come up with B ??? ...atleast i dont get it


Anyways in summary ...N cant be determined from anything ..it can be 2,3,5, or 7 so E all the way
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Re: Is N + 2 > 8 ? [#permalink] New post 29 Apr 2010, 03:55
Friends ..i also do not agree with the answer, E may be the answer.
In statement (2) we cannot assume anything unless the problem says something like N is a single prime digit less than 10 and greater than 5.. if not we end up with two answers 2,3,5 gives False and 7 gives True, Hence Insuff.

Btw he Source of this problem and answer is from Conquering Mcgraw hill GMAT Math Quant. Its a sample test from previous GMAT questions.

Last edited by zz0vlb on 29 Apr 2010, 04:11, edited 1 time in total.
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Re: Is N + 2 > 8 ? [#permalink] New post 29 Apr 2010, 04:00
I am not sure if i have heard of this source "Conquering Mcgraw hill GMAT Math Quant"
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Re: Is N + 2 > 8 ? [#permalink] New post 04 May 2010, 19:39
Disagree with the answer - I say E

Stmt 1 - can produce answers >8 or <8 - INSUFF

Stmt 2 - 5+2=7<8
but
7+2=9>8

INS

Stmt 2 just narrows down Stmt 1, but does not give a definitive answer
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Re: Is N + 2 > 8 ? [#permalink] New post 04 May 2010, 20:13
I agree with E

it is asking if N>6

In statement 1: 1<=N<=9 thus we don't know so Insufficient

Statement 2:One digit prime = 2,3,5,7 If N = 2,3,5 we get NO N is not greater than 6, however if N = 7 (which is an option) we get YES N is greater than 6. The statements conflict NS

Together - Statement 1 adds nothing to Statement 2 thus together they are NS

E
Re: Is N + 2 > 8 ?   [#permalink] 04 May 2010, 20:13
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