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

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Is rst = 1? 1. rs = 1 2. st = 1 [#permalink] New post 18 Dec 2007, 11:54
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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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 [#permalink] New post 18 Dec 2007, 12:02
Expert's post
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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 [#permalink] New post 18 Dec 2007, 12:08
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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 [#permalink] New post 18 Dec 2007, 12:14
Expert's post
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.

Last edited by walker on 18 Dec 2007, 12:23, edited 1 time in total.
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Re: CRAZY DS Problem [#permalink] New post 18 Dec 2007, 12:21
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: CRAZY DS Problem [#permalink] New post 18 Dec 2007, 12:23
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
Re: CRAZY DS Problem   [#permalink] 18 Dec 2007, 12:23
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