It is currently 21 Sep 2017, 19:53

### GMAT Club Daily Prep

#### Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

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

Author Message
Manager
Joined: 02 Feb 2007
Posts: 117

Kudos [?]: 12 [0], given: 0

Is rst = 1? 1. rs = 1 2. st = 1 [#permalink]

### Show Tags

18 Dec 2007, 12:54
00:00

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions

### HideShow timer Statistics

This topic is locked. If you want to discuss this question please re-post it in the respective forum.

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

Kudos [?]: 12 [0], given: 0

CEO
Joined: 17 Nov 2007
Posts: 3585

Kudos [?]: 4474 [0], given: 360

Concentration: Entrepreneurship, Other
Schools: Chicago (Booth) - Class of 2011
GMAT 1: 750 Q50 V40

### Show Tags

18 Dec 2007, 13:02
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

Kudos [?]: 4474 [0], given: 360

Manager
Joined: 02 Feb 2007
Posts: 117

Kudos [?]: 12 [0], given: 0

### Show Tags

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

Kudos [?]: 12 [0], given: 0

CEO
Joined: 17 Nov 2007
Posts: 3585

Kudos [?]: 4474 [0], given: 360

Concentration: Entrepreneurship, Other
Schools: Chicago (Booth) - Class of 2011
GMAT 1: 750 Q50 V40

### Show Tags

18 Dec 2007, 13:14
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, 13:23, edited 1 time in total.

Kudos [?]: 4474 [0], given: 360

CEO
Joined: 21 Jan 2007
Posts: 2736

Kudos [?]: 1023 [0], given: 4

Location: New York City

### Show Tags

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

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

Kudos [?]: 1023 [0], given: 4

CEO
Joined: 21 Jan 2007
Posts: 2736

Kudos [?]: 1023 [0], given: 4

Location: New York City

### Show Tags

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

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

Kudos [?]: 1023 [0], given: 4

Re: CRAZY DS Problem   [#permalink] 18 Dec 2007, 13:23
Display posts from previous: Sort by