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# ds - easy inequality or so i thought

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Senior Manager
Joined: 14 Aug 2006
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ds - easy inequality or so i thought [#permalink]

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14 Dec 2006, 23:34
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Is x > y?

1. x/(3y) > 1/3
2 -x + p < -y + p
Director
Joined: 06 Feb 2006
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15 Dec 2006, 01:21
Isn't it D?
Manager
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15 Dec 2006, 01:47
Nuu. It's B

Be extra careful with inequality of unknown.
Because if these unknowns are negative, you gotta flip the direction of '>' accordingly. But if they are positive, you don't have to.

Always consider the possibility of the unknown being positive AND negative.

x/y > 1
could be
1)-10/-1 > 1 OR
2) 10/1 > 1

So, we are not sure which is the case
_________________

livin in a prison island...

Director
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15 Dec 2006, 08:54
Thanks! I got it wrong too, I will know to look out for this going forward.

Viperace wrote:
Nuu. It's B

Be extra careful with inequality of unknown.
Because if these unknowns are negative, you gotta flip the direction of '>' accordingly. But if they are positive, you don't have to.

Always consider the possibility of the unknown being positive AND negative.

x/y > 1
could be
1)-10/-1 > 1 OR
2) 10/1 > 1

So, we are not sure which is the case
SVP
Joined: 05 Jul 2006
Posts: 1747
Followers: 6

Kudos [?]: 358 [0], given: 49

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15 Dec 2006, 12:14
Is x > y?

1. x/(3y) > 1/3
2 -x + p < -y + p

x/3y>1/3 ie : 3y/x<3 thus either y/x is +ve or -ve fraction and x>y or both x, y -ve and x< or >y....insuff

from two
-x<-y thus x>y sufff

15 Dec 2006, 12:14
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