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Is a/b>0?

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Is a/b>0? [#permalink]

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New post 11 Nov 2017, 10:19
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A
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Difficulty:

  55% (hard)

Question Stats:

59% (01:21) correct 41% (01:11) wrong based on 87 sessions

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Is \(\frac{a}{b}>0\)?

(1) \(a+b = 0\)
(2) \(|\frac{a}{b}|>0\)


self made
[Reveal] Spoiler: OA

_________________

Absolute modulus :http://gmatclub.com/forum/absolute-modulus-a-better-understanding-210849.html#p1622372
Combination of similar and dissimilar things : http://gmatclub.com/forum/topic215915.html

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Re: Is a/b>0? [#permalink]

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New post 11 Nov 2017, 10:45
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chetan2u wrote:
Is \(\frac{a}{b}>0\)?

(1) \(a+b = 0\)
(2) \(|\frac{a}{b}|>0\)


self made


Statement 1: implies \(b=-a\), So \(\frac{a}{b} = \frac{a}{-a} = -1\)

So we have a NO for our question stem. Sufficient

Statement 2: mod will always be greater than or equal to \(0\). hence \(a\) and \(b\) can have any sign

for eg. \(a=-2\), \(b=1\), \(\frac{a}{b}<0\) but \(|\frac{a}{b}|>0\)

and if \(a=b=1\), then \(\frac{a}{b}>0\) and \(|\frac{a}{b}|>0\). So Insufficient

Option A

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Re: Is a/b>0? [#permalink]

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New post 15 Nov 2017, 01:02
chetan2u wrote:
Is \(\frac{a}{b}>0\)?

(1) \(a+b = 0\)
(2) \(|\frac{a}{b}|>0\)


self made


For yes/no DS questions, the correct answer is definitely yes or definitely NO .

Statement 1 is a define No while statement 2 is a definite yes. so the correct answer should be D

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Re: Is a/b>0? [#permalink]

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New post 15 Nov 2017, 01:05
IMO A
Stmt 1 tells a and b have opposite signs. So a/b<0. Sufficient

Stmt 2 tells a/b>0 or a/b<0

Posted from my mobile device

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Re: Is a/b>0? [#permalink]

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New post 15 Nov 2017, 02:15
Aussy2000 wrote:
chetan2u wrote:
Is \(\frac{a}{b}>0\)?

(1) \(a+b = 0\)
(2) \(|\frac{a}{b}|>0\)


self made


For yes/no DS questions, the correct answer is definitely yes or definitely NO .

Statement 1 is a define No while statement 2 is a definite yes. so the correct answer should be D


Hi Aussy2000

Can you explain how Statement 2 proves that \(\frac{a}{b}>0\) ?

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Re: Is a/b>0? [#permalink]

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New post 15 Nov 2017, 11:22
Aussy2000 wrote:
chetan2u wrote:
Is \(\frac{a}{b}>0\)?

(1) \(a+b = 0\)
(2) \(|\frac{a}{b}|>0\)


self made


For yes/no DS questions, the correct answer is definitely yes or definitely NO .

Statement 1 is a define No while statement 2 is a definite yes. so the correct answer should be D


Hi Aussy

Statement 2 is actually NOT a definite yes. Its given that |a/b| > 0 or modulus of a/b is positive. For any non-zero number, its modulus will be positive only.

We can have say a=b=2, and so a/b = 2/2 =1 and |a/b| = 1. Here a/b > 0 and |a/b| is also > 0

But we can also have say a=-2 and b=2 and so a/b = -2/2 = -1 but |a/b| = 1. So here a/b < 0 but |a/b| >0

So we can't say whether a/b will be positive or negative on the basis of second statement.

Also in GMAT, whenever the answer is D, both statements give the same answer. So its NOT possible to get No from statement 1 and Yes from statement 2. If I ever come across such a case in my practice (different answers from the two statements) I know I am going off somewhere and I recheck.

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Re: Is a/b>0? [#permalink]

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New post 17 Nov 2017, 08:51
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chetan2u wrote:
Is \(\frac{a}{b}>0\)?

(1) \(a+b = 0\)
(2) \(|\frac{a}{b}|>0\)


self made


Hi chetan2u

Can you explain why option A is incorrect and why C is correct choice here?

Kudos [?]: 304 [1], given: 39

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Is a/b>0? [#permalink]

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New post 17 Nov 2017, 08:56
niks18 wrote:
chetan2u wrote:
Is \(\frac{a}{b}>0\)?

(1) \(a+b = 0\)
(2) \(|\frac{a}{b}|>0\)


self made


Hi chetan2u

Can you explain why option A is incorrect and why C is correct choice here?


hi..
Typo.. ans is A .. Thanks
Kudos for pointing out
_________________

Absolute modulus :http://gmatclub.com/forum/absolute-modulus-a-better-understanding-210849.html#p1622372
Combination of similar and dissimilar things : http://gmatclub.com/forum/topic215915.html

Kudos [?]: 6088 [0], given: 121

Director
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Joined: 25 Feb 2013
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Re: Is a/b>0? [#permalink]

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New post 17 Nov 2017, 08:59
chetan2u wrote:
niks18 wrote:
chetan2u wrote:
Is \(\frac{a}{b}>0\)?

(1) \(a+b = 0\)
(2) \(|\frac{a}{b}|>0\)


self made


Hi chetan2u

Can you explain why option A is incorrect and why C is correct choice here?


hi..
Typo.. ans is A .. Thanks
Kudos for pointing out


Thanks chetan2u for clarifying. I have been scratching my head for past half an hour to arrive at C :lol: :lol: :lol:

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Re: Is a/b>0? [#permalink]

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New post 17 Nov 2017, 09:24
chetan2u wrote:
niks18 wrote:
chetan2u wrote:
Is \(\frac{a}{b}>0\)?

(1) \(a+b = 0\)
(2) \(|\frac{a}{b}|>0\)


self made


Hi chetan2u

Can you explain why option A is incorrect and why C is correct choice here?


hi..
Typo.. ans is A .. Thanks
Kudos for pointing out


Hi chetan2u,

May be not worth asking, still...

From statement A, A+B=0, we could have A=B=0, So 0/0 ---Undefined ..... We don't know its +ve or -ve. Can we definitely arrive at a conclusion?

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Re: Is a/b>0? [#permalink]

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New post 17 Nov 2017, 10:53
Hi chetan2u,

May be not worth asking, still...

From statement A, A+B=0, we could have A=B=0, So 0/0 ---Undefined ..... We don't know its +ve or -ve. Can we definitely arrive at a conclusion?[/quote]


Hi

Chetan will be best to answer this, but in my opinion, even if its not specified, we can ignore such things where we know its undefined. so eg - if its given that x/y > 2, we have to assume y not equal to 0, because otherwise the question stem becomes not defined. Similarly here I think we can safely assume that A and B will not be 0, because then A/B will become undefined.

Kudos [?]: 180 [0], given: 284

Re: Is a/b>0?   [#permalink] 17 Nov 2017, 10:53
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