DS - Integer : DS Archive
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# DS - Integer

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08 Jan 2004, 08:55
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DS - Integer
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Director
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08 Jan 2004, 10:12
MartinMag wrote:
DS - Integer

I get c

x^2+5y=49

1) insufficient - too many values - x doesn't have to be an integer either.

2) insufficient on it's own - can be any value - thus y may or may not be an integer

together:

yes - you're left with integers 2 and 3 which both give 'yes' answers.
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08 Jan 2004, 14:26
I also got C.

But the OA is E!!!

This is a Kaplan question from one of its CATs. Could it be that we have to put up with not only tougher and longer questions than the real GMAT but also with wrong answers?
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08 Jan 2004, 14:30
I am almost certain that the OA is incorrect. Kaplan material is highly suspect - I took their course a few months ago - It was terrible!
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08 Jan 2004, 16:40
lets dissect it further:

1) doesn't tell us whether it is an integer or not
2) X^2 is an integer ... what else do we need to prove

1 and 2, integer X is between 1 and 4 i.e. 2 or 3. square either of these and subtract from 49.... what we get..an integer.

hmm..
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08 Jan 2004, 16:47
dj wrote:
lets dissect it further:

1) doesn't tell us whether it is an integer or not
2) X^2 is an integer ... what else do we need to prove

1 and 2, integer X is between 1 and 4 i.e. 2 or 3. square either of these and subtract from 49.... what we get..an integer.

hmm..

E is definitely the answer, after having a beer and pizza - it hit me. x^2 can be an integer but x does not have to be. example - 1.733 = x thus x^2 will be 3 thus you'll be left with yes, no. Tis a tricky little bugger!
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08 Jan 2004, 17:15
Titleist wrote:
dj wrote:
lets dissect it further:

1) doesn't tell us whether it is an integer or not
2) X^2 is an integer ... what else do we need to prove

1 and 2, integer X is between 1 and 4 i.e. 2 or 3. square either of these and subtract from 49.... what we get..an integer.

hmm..

E is definitely the answer, after having a beer and pizza - it hit me. x^2 can be an integer but x does not have to be. example - 1.733 = x thus x^2 will be 3 thus you'll be left with yes, no. Tis a tricky little bugger!

Titleist, sqrt(3) = 1.7320508075688772935274463415059 ......
noone is gonna take square of this as an integer..

sq of a real value can't be an integer ...
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08 Jan 2004, 17:25
dj wrote:
Titleist wrote:
dj wrote:
lets dissect it further:

1) doesn't tell us whether it is an integer or not
2) X^2 is an integer ... what else do we need to prove

1 and 2, integer X is between 1 and 4 i.e. 2 or 3. square either of these and subtract from 49.... what we get..an integer.

hmm..

E is definitely the answer, after having a beer and pizza - it hit me. x^2 can be an integer but x does not have to be. example - 1.733 = x thus x^2 will be 3 thus you'll be left with yes, no. Tis a tricky little bugger!

Titleist, sqrt(3) = 1.7320508075688772935274463415059 ......
noone is gonna take square of this as an integer..

sq of a real value can't be an integer ...

Why not? As infinite as the decimals are, 1.732... is in the range 1<x<4. And if squared, it is the number 3. I'm assuming this is what Kraplan is thinking.
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08 Jan 2004, 17:41
Titleist wrote:
dj wrote:
Titleist wrote:
dj wrote:
lets dissect it further:

1) doesn't tell us whether it is an integer or not
2) X^2 is an integer ... what else do we need to prove

1 and 2, integer X is between 1 and 4 i.e. 2 or 3. square either of these and subtract from 49.... what we get..an integer.

hmm..

E is definitely the answer, after having a beer and pizza - it hit me. x^2 can be an integer but x does not have to be. example - 1.733 = x thus x^2 will be 3 thus you'll be left with yes, no. Tis a tricky little bugger!

Titleist, sqrt(3) = 1.7320508075688772935274463415059 ......
noone is gonna take square of this as an integer..

sq of a real value can't be an integer ...

Why not? As infinite as the decimals are, 1.732... is in the range 1<x<4. And if squared, it is the number 3. I'm assuming this is what Kraplan is thinking.

I don't think this is easy for a logical gmat test-maker to digest. if the question asks to provide the approx value, then I will bow, else nayy...
kaplan's thinking is OHT (over-head transmission) for me. one can comprehend better, thru kaplan, only if one tries to put his/her own reasoning.. hate kaplan haha..!!
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08 Jan 2004, 17:49
dj wrote:
Titleist wrote:
dj wrote:
Titleist wrote:
dj wrote:
lets dissect it further:

1) doesn't tell us whether it is an integer or not
2) X^2 is an integer ... what else do we need to prove

1 and 2, integer X is between 1 and 4 i.e. 2 or 3. square either of these and subtract from 49.... what we get..an integer.

hmm..

E is definitely the answer, after having a beer and pizza - it hit me. x^2 can be an integer but x does not have to be. example - 1.733 = x thus x^2 will be 3 thus you'll be left with yes, no. Tis a tricky little bugger!

Titleist, sqrt(3) = 1.7320508075688772935274463415059 ......
noone is gonna take square of this as an integer..

sq of a real value can't be an integer ...

Why not? As infinite as the decimals are, 1.732... is in the range 1<x<4. And if squared, it is the number 3. I'm assuming this is what Kraplan is thinking.

I don't think this is easy for a logical gmat test-maker to digest. if the question asks to provide the approx value, then I will bow, else nayy...
kaplan's thinking is OHT (over-head transmission) for me. one can comprehend better, thru kaplan, only if one tries to put his/her own reasoning.. hate kaplan haha..!!

Dj, you're just too smart for this exam - definitely smarter than the test writers at Kraplan. I think the little devils at ETS may also pull this crap on the exam.
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08 Jan 2004, 17:57
wow.. u dexterously replaced the registered TM with "krap-lan" .
too smart..haan
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08 Jan 2004, 18:09
dj wrote:
wow.. u dexterously replaced the registered TM with "krap-lan" .
too smart..haan

I'm a sneaky little devil too!
08 Jan 2004, 18:09
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