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is |x^2-3|>2 1) x^2 is an integer 2) x is a prime integer

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is |x^2-3|>2 1) x^2 is an integer 2) x is a prime integer [#permalink]

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New post 06 Sep 2008, 20:35
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is |x^2-3|>2

1) x^2 is an integer
2) x is a prime integer and is not a factor of 128.

Kudos [?]: 221 [1], given: 0

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Joined: 29 Aug 2007
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Kudos [?]: 841 [0], given: 19

Re: modulus 4 [#permalink]

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New post 06 Sep 2008, 20:41
arjtryarjtry wrote:
is |x^2-3|>2

1) x^2 is an integer
2) x is a prime integer and is not a factor of 128.


1: if x = 1 or 2 pr 3, nsf.
2: so x is not 2 but could be 3 or 5 or 7 or so on. nsf.
togather also x could be 3. nsf.

//E//
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Kudos [?]: 841 [0], given: 19

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Re: modulus 4 [#permalink]

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New post 06 Sep 2008, 20:50
this was my own creation...
i thought that the only way to work on my weak point is to create problems...
:P

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Re: modulus 4 [#permalink]

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New post 07 Sep 2008, 00:17
GMAT TIGER wrote:
arjtryarjtry wrote:
is |x^2-3|>2

1) x^2 is an integer
2) x is a prime integer and is not a factor of 128.


1: if x = 1 or 2 pr 3, nsf.
2: so x is not 2 but could be 3 or 5 or 7 or so on. nsf.
togather also x could be 3. nsf.

//E//


Could you please explain why is option 2 not sufficient?
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Kudos [?]: 45 [0], given: 0

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Kudos [?]: 841 [0], given: 19

Re: modulus 4 [#permalink]

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New post 07 Sep 2008, 00:27
GMBA85 wrote:
GMAT TIGER wrote:
arjtryarjtry wrote:
is |x^2-3|>2

1) x^2 is an integer
2) x is a prime integer and is not a factor of 128.


1: if x = 1 or 2 pr 3, nsf.
2: so x is not 2 but could be 3 or 5 or 7 or so on. nsf.
togather also x could be 3. nsf.

//E//


Could you please explain why is option 2 not sufficient?


you are correct. its in fact //B//.

i overlooked x^2 as x.
_________________

Verbal: http://gmatclub.com/forum/new-to-the-verbal-forum-please-read-this-first-77546.html
Math: http://gmatclub.com/forum/new-to-the-math-forum-please-read-this-first-77764.html
Gmat: http://gmatclub.com/forum/everything-you-need-to-prepare-for-the-gmat-revised-77983.html


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Kudos [?]: 841 [0], given: 19

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Kudos [?]: 45 [0], given: 0

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Re: modulus 4 [#permalink]

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New post 07 Sep 2008, 00:37
you are correct. its in fact //B//.

i overlooked x^2 as x.[/quote]

GMAT TIGER - thx for the quick reply

arjtryarjtry - awaiting more of such questions from you. It definitely helps u clear fundae and brings quite a bit of clarity. well done!

_________________

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Kudos [?]: 45 [0], given: 0

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Re: modulus 4 [#permalink]

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New post 08 Sep 2008, 01:45
I also fell into trap......wrongly took x for x^2.

arjtryarjtry, well made question.

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Re: modulus 4   [#permalink] 08 Sep 2008, 01:45
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