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Is rst = 1? 1. rs = 1 2. st = 1

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michaelny2001
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Is rst = 1? 1. rs = 1 2. st = 1 [#permalink] New post   18 Dec 2007, 12:54
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E

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Hey guys, i had a very hard time understanding this one. if somebody could explain it why it is the way it is it would be great!!!


Is rst = 1?

1. rs = 1

2. st = 1



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Re: Is rst = 1? 1. rs = 1 2. st = 1 [#permalink] New post   18 Dec 2007, 13:02
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E

r=1, s=1, t=1: satisfies two conditions and rst=1
r=1/2, s=2, t=1/2: satisfies two conditions and rst=1/2<1
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Re: Is rst = 1? 1. rs = 1 2. st = 1 [#permalink] New post   18 Dec 2007, 13:08
Walker,

i agree with you, the answer is E.
But shouldn't we look at each statement alone and ignore the info on the other? I am only asking not to go against you , but if something similar will happen on the real exam i will need to be ready.
thanks




walker wrote:
E

r=1, s=1, t=1: satisfies two conditions and rst=1
r=1/2, s=2, t=1/2: satisfies two conditions and rst=1/2<1
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Re: Is rst = 1? 1. rs = 1 2. st = 1 [#permalink] New post   Updated on: 18 Dec 2007, 13:23
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If we have statements alone we will have:

1) rst=(rs)t=t, so t=1 ==> rst=1, but t<>1 ==> rst<>1. INSUFF.
1) rst=r(st)=t, so r=1 ==> rst=1, but r<>1 ==> rst<>1. INSUFF.

Originally posted by walker on 18 Dec 2007, 13:14.
Last edited by walker on 18 Dec 2007, 13:23, edited 1 time in total.
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Re: Is rst = 1? 1. rs = 1 2. st = 1 [#permalink] New post   18 Dec 2007, 13:21
michaelny2001 wrote:
Hey guys, i had a very hard time understanding this one. if somebody could explain it why it is the way it is it would be great!!!


Is rst = 1?

1. rs = 1

2. st = 1


whats so hard about it?

1. RS = 1
both are negative 1 OR both are positive 1
no info on T
T can be 0 or 9999

2. same logic as 1

taken together, s is negative 1 or positive 1, the other variables are also undefined.

E
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Re: Is rst = 1? 1. rs = 1 2. st = 1 [#permalink] New post   18 Dec 2007, 13:23
bmwhype2 wrote:
michaelny2001 wrote:
Hey guys, i had a very hard time understanding this one. if somebody could explain it why it is the way it is it would be great!!!


Is rst = 1?

1. rs = 1

2. st = 1


whats so hard about it?

1. RS = 1
both are negative 1 OR both are positive 1
no info on T
T can be 0 or 9999

2. same logic as 1

taken together, s is negative 1 or positive 1, the other variables are also undefined.

E


in addition, the equation did not say they were integers. statement 1 could be 1/9 * 9. basically, there are infinite ways to make rs = 1 or any of the variables



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Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Data Sufficiency (DS) Forum
Still interested in this question? Check out the "Best Topics" block above for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!
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Re: Is rst = 1? 1. rs = 1 2. st = 1 [#permalink]
18 Dec 2007, 13:23
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