Looks easy but OA puzzles me...

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cramya: Legendary Member; Posts: 2467; Joined: Thu Aug 28, 2008 6:14 pmFollowed by: 11 members; Thanked: 331 times

by cramya » Sat May 09, 2009 4:22 pm

If n is a positive integer is n equal to 100?
(1)sqrt(n) >9
(2) sqrt(n)>11

[spoiler]OA : Given as E[/spoiler]

I would go with B and may be I am having a brain freeze.....

Source: Another gmat forum

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Source: Beat The GMAT — Data Sufficiency | Sat May 09, 2009 4:22 pm

chetanojha: Master | Next Rank: 500 Posts; Posts: 125; Joined: Sun Sep 16, 2007 1:38 pm; Thanked: 6 times

by chetanojha » Sat May 09, 2009 8:37 pm

Looks B to me as well.

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cramya: Legendary Member; Posts: 2467; Joined: Thu Aug 28, 2008 6:14 pmFollowed by: 11 members; Thanked: 331 times

by cramya » Sat May 09, 2009 8:59 pm

Thanks Ojha.

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kic883: Newbie | Next Rank: 10 Posts; Posts: 6; Joined: Tue Mar 31, 2009 3:15 am

Re: Looks easy but OA puzzles me...

by kic883 » Sat May 09, 2009 9:30 pm

cramya wrote:If n is a positive integer is n equal to 100?
(1)sqrt(n) >9
(2) sqrt(n)>11

[spoiler]OA : Given as E[/spoiler]

I would go with B and may be I am having a brain freeze.....

Source: Another gmat forum

My answer is B as well.
Something wrong with the OA ?

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Vemuri: Legendary Member; Posts: 682; Joined: Fri Jan 16, 2009 2:40 amFollowed by: 1 member; Thanked: 32 times

Re: Looks easy but OA puzzles me...

by Vemuri » Sun May 10, 2009 5:13 am

Hi Cramya,

You are right. The answer should be B.

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success1111: Senior | Next Rank: 100 Posts; Posts: 87; Joined: Sun Apr 19, 2009 11:07 pm

Re: Looks easy but OA puzzles me...

by success1111 » Mon May 11, 2009 5:46 am

cramya wrote:If n is a positive integer is n equal to 100?
(1)sqrt(n) >9
(2) sqrt(n)>11

[spoiler]OA : Given as E[/spoiler]

I would go with B and may be I am having a brain freeze.....

Source: Another gmat forum

I am surprised you guys were chosing B.
The question is asking "is a positive integer is n equal to 100" not greater than 100.

1) Sqrt(n) could be 10 i.e 100 or 11 i.e 121,12 i.e 144, 13 i.e 169 so insufficient

2) Similarly, sqrt (n) could be 12 i.e 144, or 13 i.e 169

The best answer is E

Trust but verify.

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Mr2Bits: Senior | Next Rank: 100 Posts; Posts: 73; Joined: Wed Jan 07, 2009 1:00 pm; Location: Tampa, FL; Thanked: 9 times; GMAT Score:630

by Mr2Bits » Mon May 11, 2009 7:21 am

I get E pretty clearly as well. Unless their is a typo in answer (2) without a doubt E.

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schumi_gmat: Master | Next Rank: 500 Posts; Posts: 377; Joined: Wed Sep 03, 2008 9:30 amFollowed by: 2 members; Thanked: 15 times

by schumi_gmat » Mon May 11, 2009 8:56 am

2) Similarly, sqrt (n) could be 12 i.e 144, or 13 i.e 169

This clearly tells that n not equal to 100.
Answer is No

and hence B

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dmateer25: Community Manager; Posts: 1049; Joined: Sun Apr 06, 2008 5:15 pmFollowed by: 27 members; Location: Pittsburgh, PA; Thanked: 113 times; GMAT Score:710

by dmateer25 » Mon May 11, 2009 9:59 am

I found the question posted on two forums other than BTG.

on testmagic, they have statement 2 as (2) sqrt(n)>11.

If this is the case then the answer would be B.

On gmatclub, the 2nd statement is posted as (2) sqrt(n)<11.

If this is the case, then the answer would be E because n could be anything less than 121 but greater than 81.

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cramya: Legendary Member; Posts: 2467; Joined: Thu Aug 28, 2008 6:14 pmFollowed by: 11 members; Thanked: 331 times

by cramya » Mon May 11, 2009 6:41 pm

Thanks for the clarification, Dmateer.

Regards,
CR

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lunarpower: GMAT Instructor; Posts: 3380; Joined: Mon Mar 03, 2008 1:20 amFollowed by: 1535 members; Thanked: 2256 times; GMAT Score:800

by lunarpower » Wed May 13, 2009 3:21 am

dmateer25 wrote:I found the question posted on two forums other than BTG.

on testmagic, they have statement 2 as (2) sqrt(n)>11.

If this is the case then the answer would be B.

On gmatclub, the 2nd statement is posted as (2) sqrt(n)<11.

If this is the case, then the answer would be E because n could be anything less than 121 but greater than 81.

heh.

goes to show. these are among the most common, and most insidious, of mistakes.

ALWAYS double- and triple-check inequality signs. you'd be surprised by how easy it is to mistake ">" for "<", especially under test pressure.

there are some things for which it's ok to miss points. this, however, is not one of them.

Ron has been teaching various standardized tests for 20 years.

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