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OAs 1 -> C 2 -> E

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Senior Manager
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OAs 1 -> C 2 -> E [#permalink] New post 28 Apr 2008, 08:59
00:00
A
B
C
D
E

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(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
OAs
1 -> C
2 -> E
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Senior Manager
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Re: GMATPrep 2 - DS [#permalink] New post 28 Apr 2008, 10:40
kyatin wrote:
OAs
1 -> C
2 -> E

a)

1 ) p-q > n

you can put it as p >q+n ; insuff no information about n , n could be +ve or -ve

2) q>p ; doesn't give us information about n at all ; insuff

combining the both if p>q+n and q>p ; n has to be -ve and given that p and q are both positive we know n is < p and q both .

-------------------------------------------------------

b)


1) doesn't give information about y intercept -insuff
2) doesn't give information about y intercept again so insuff . it just tells us slope is downward passing from II quadrant to iV quadrant or passing from IInd quadrant to IIIrd quadrant .

so answer should be E

I think what will make this sufficient is either information about y intercept or any x,y coordinate of line k , any thoughts anyone?
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Re: GMATPrep 2 - DS [#permalink] New post 28 Apr 2008, 11:00
rpmodi wrote:
kyatin wrote:
OAs
1 -> C
2 -> E

a)

1 ) p-q > n

you can put it as p >q+n ; insuff no information about n , n could be +ve or -ve

2) q>p ; doesn't give us information about n at all ; insuff

combining the both if p>q+n and q>p ; n has to be -ve and given that p and q are both positive we know n is < p and q both .

-------------------------------------------------------

b)


1) doesn't give information about y intercept -insuff
2) doesn't give information about y intercept again so insuff . it just tells us slope is downward passing from II quadrant to iV quadrant or passing from IInd quadrant to IIIrd quadrant .

so answer should be E

I think what will make this sufficient is either information about y intercept or any x,y coordinate of line k , any thoughts anyone?



On Circle-line question, I though C. But I see my mistake. X intercept "greater" than one is pretty much useless info. Cant be used to determine a unique line.
I thought if slope is given which is -1/10 then X intercept being more than 1 means Y intercept has to be greater than 10 ( is that good assumption?). I was not sure if such line having X intercept greater than 1 and Y intercept greater than 10, would intersect circle of radius 1. Any thoughts on that?
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Re: GMATPrep 2 - DS [#permalink] New post 28 Apr 2008, 11:00
kyatin,

Please separate and post one question at a time. In conjunction with the other question, I am confused out of my mind :P

1 at a time please.
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Re: GMATPrep 2 - DS [#permalink] New post 28 Apr 2008, 12:07
Quote:
On Circle-line question, I though C. But I see my mistake. X intercept "greater" than one is pretty much useless info. Cant be used to determine a unique line.
I thought if slope is given which is -1/10 then X intercept being more than 1 means Y intercept has to be greater than 10 ( is that good assumption?). I was not sure if such line having X intercept greater than 1 and Y intercept greater than 10, would intersect circle of radius 1. Any thoughts on that?


x intercept being more than one and slope = -1/10 will not give us enuf information about y intecept

take this example

let's assume x intercept = 2
y=mx+b
0=(-1/10)*2+b ; b = 0.2 , so yes line will intersect circle

let's assume x intercept =20
0=(-1/10)*20+b b=2 ; line will not intersect circle .

Hope that helps .....
Senior Manager
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Joined: 29 Jan 2007
Posts: 451
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Re: GMATPrep 2 - DS [#permalink] New post 28 Apr 2008, 12:37
rpmodi wrote:
Quote:
On Circle-line question, I though C. But I see my mistake. X intercept "greater" than one is pretty much useless info. Cant be used to determine a unique line.
I thought if slope is given which is -1/10 then X intercept being more than 1 means Y intercept has to be greater than 10 ( is that good assumption?). I was not sure if such line having X intercept greater than 1 and Y intercept greater than 10, would intersect circle of radius 1. Any thoughts on that?


x intercept being more than one and slope = -1/10 will not give us enuf information about y intecept

take this example

let's assume x intercept = 2
y=mx+b
0=(-1/10)*2+b ; b = 0.2 , so yes line will intersect circle

let's assume x intercept =20
0=(-1/10)*20+b b=2 ; line will not intersect circle .

Hope that helps .....


I saw my mistake , another one.

m = \frac{\Delta y}{\Delta x}

and NOT \frac{\Delta x}{\Delta y}

That was great....dont know why I just dint plug in the numbers. :twisted:
Re: GMATPrep 2 - DS   [#permalink] 28 Apr 2008, 12:37
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