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Is st = t ?

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Is st = t ?  [#permalink]

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New post 07 Jun 2014, 12:04
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Is st = t ?

(1) s = st

(2) t = ts
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Re: Is st = t ?  [#permalink]

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New post 07 Jun 2014, 12:13
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Re: Is st = t ?  [#permalink]

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New post 08 Jun 2014, 21:48
1
Bunuel wrote:
Is st = t ?

Is \(st = t\)? --> is \(s=1\) or \(t=0\) (or both)?

(1) s = st --> \(s=0\) or \(t=1\) (or both). Not sufficient.

(2) t = ts. Directly answers the question. Sufficient.

Answer: B.


Hi Bunuel,

from st (1) : we know that 's' not equals 1 or 't' not equals 0 or both , so is this st not sufficient alone.

Pls clarify
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Re: Is st = t ?  [#permalink]

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New post 09 Jun 2014, 01:02
2
1
thoufique wrote:
Bunuel wrote:
Is st = t ?

Is \(st = t\)? --> is \(s=1\) or \(t=0\) (or both)?

(1) s = st --> \(s=0\) or \(t=1\) (or both). Not sufficient.

(2) t = ts. Directly answers the question. Sufficient.

Answer: B.


Hi Bunuel,

from st (1) : we know that 's' not equals 1 or 't' not equals 0 or both , so is this st not sufficient alone.

Pls clarify


Consider this:
If \(s=0\) and \(t\neq{0}\) (\(s = st\)), then \(st\neq{t}\). Or if \(t=1\) and \(s\neq{1}\) (\(s = st\)), then \(st\neq{t}\). So, for these cases the answer to the question is NO.

If \(s=t=0\) (\(s = st\)), then \(st={t}\). Or if \(s=t=1\) (\(s = st\)), then \(st={t}\). So, for these cases the answer to the question is YES.

Does this make sense?
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Re: Is st = t ?  [#permalink]

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New post 09 Jun 2014, 09:12
Quote:
Consider this:
If \(s=0\) and \(t\neq{0}\) (\(s = st\)), then \(st\neq{t}\). Or if \(t=1\) and \(s\neq{1}\) (\(s = st\)), then \(st\neq{t}\). So, for these cases the answer to the question is NO.

If \(s=t=0\) (\(s = st\)), then \(st={t}\). Or if \(s=t=1\) (\(s = st\)), then \(st={t}\). So, for these cases the answer to the question is YES.

Does this make sense?



Yes Bunuel, when we consider values it makes sense.
But I am unable to get to this directly with out plugging values.
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Re: Is st = t ?  [#permalink]

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New post 10 Jun 2017, 07:13
2
Bunuel wrote:
Is st = t ?

Is \(st = t\)? --> is \(s=1\) or \(t=0\) (or both)?

(1) s = st --> \(s=0\) or \(t=1\) (or both). Not sufficient.

(2) t = ts. Directly answers the question. Sufficient.

Answer: B.



For (1)

could be also assume following cases ?

case 1: s=t=0 then s=st

case 2: s=5,t=1 then s≠st

thanks =)
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Re: Is st = t ?  [#permalink]

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New post 08 Dec 2017, 10:02
Bunuel wrote:
Is st = t ?

Is \(st = t\)? --> is \(s=1\) or \(t=0\) (or both)?

(1) s = st --> \(s=0\) or \(t=1\) (or both). Not sufficient.

(2) t = ts. Directly answers the question. Sufficient.

Answer: B.

@bunnel If we have a statement that restates the question , then it becomes insufficient as we don't have any additional information to answer the question. But here the equality nullifies it and directly answers the question. Hence it is sufficient. IS this reasoning correct ?
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Re: Is st = t ?  [#permalink]

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New post 08 Dec 2017, 10:09
Raksat wrote:
Bunuel wrote:
Is st = t ?

Is \(st = t\)? --> is \(s=1\) or \(t=0\) (or both)?

(1) s = st --> \(s=0\) or \(t=1\) (or both). Not sufficient.

(2) t = ts. Directly answers the question. Sufficient.

Answer: B.

@bunnel If we have a statement that restates the question , then it becomes insufficient as we don't have any additional information to answer the question. But here the equality nullifies it and directly answers the question. Hence it is sufficient. IS this reasoning correct ?
i


Not sure I can follow you.

Say the question asks: is x = 1? And (1) says that x = 1. In this case (1) is sufficient as it directly answers the question: YES x does equal to 1. This is EXACTLY the case we have with the above question.
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Collection of Questions:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

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Re: Is st = t ?  [#permalink]

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New post 08 Dec 2017, 10:54
Bunuel wrote:
Raksat wrote:
Bunuel wrote:
Is st = t ?

Is \(st = t\)? --> is \(s=1\) or \(t=0\) (or both)?

(1) s = st --> \(s=0\) or \(t=1\) (or both). Not sufficient.

(2) t = ts. Directly answers the question. Sufficient.

Answer: B.

@bunnel If we have a statement that restates the question , then it becomes insufficient as we don't have any additional information to answer the question. But here the equality nullifies it and directly answers the question. Hence it is sufficient. IS this reasoning correct ?
i


Not sure I can follow you.


Say the question asks: is x = 1? And (1) says that x = 1. In this case (1) is sufficient as it directly answers the question: YES x does equal to 1. This is EXACTLY the case we have with the above question.




Its about the difference between a tautological statement and this question. Reference question : https://gmatclub.com/forum/in-the-diagr ... 94414.html
In the explanation you explained " This statement repeats information in the prompt, and contains no new information, so it doesn’t help us at all to figure out anything else. This statement, alone and by itself, is not sufficient."
Here B is also reintroducing the information in question.
what's the difference ?
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Re: Is st = t ?  [#permalink]

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New post 08 Dec 2017, 11:00
1
Raksat wrote:
Bunuel wrote:
Raksat wrote:
@bunnel If we have a statement that restates the question , then it becomes insufficient as we don't have any additional information to answer the question. But here the equality nullifies it and directly answers the question. Hence it is sufficient. IS this reasoning correct ?
i


Not sure I can follow you.


Say the question asks: is x = 1? And (1) says that x = 1. In this case (1) is sufficient as it directly answers the question: YES x does equal to 1. This is EXACTLY the case we have with the above question.




Its about the difference between a tautological statement and this question. Reference question : https://gmatclub.com/forum/in-the-diagr ... 94414.html
In the explanation you explained " This statement repeats information in the prompt, and contains no new information, so it doesn’t help us at all to figure out anything else. This statement, alone and by itself, is not sufficient."
Here B is also reintroducing the information in question.
what's the difference ?


In the question you quote one of the statements says something that is generally true, so it adds not new info. It says something like x = x, that is generally true.

Here the question asks is \(st = t\)? (2) says t = ts. So, it gives an YES answer to the question.
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Please read this: Ultimate GMAT Quantitative Megathread | All You Need for Quant | PLEASE READ AND FOLLOW: 12 Rules for Posting!!!

Resources:
GMAT Math Book | Triangles | Polygons | Coordinate Geometry | Factorials | Circles | Number Theory | Remainders; 8. Overlapping Sets | PDF of Math Book; 10. Remainders | GMAT Prep Software Analysis | SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) | Tricky questions from previous years.

Collection of Questions:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


What are GMAT Club Tests?
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Re: Is st = t ?  [#permalink]

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