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If a, b, c, d, and e are integers and cde = 0, is d = 0 ?

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If a, b, c, d, and e are integers and cde = 0, is d = 0 ? [#permalink]

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New post 01 Oct 2016, 11:53
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If a, b, c, d, and e are integers and cde = 0, is d = 0 ?

(1) abc = 30
(2) ace = 0

[Reveal] Spoiler: Steps
I got the question right, but is my reasoning correct?

If cde = 0, then c, d or e must equal 0.

(1) Tells us that abc = 30. No information about d.
But we can say that c is different than 0.
Insufficient.

(2) Tells us that ace = 0. No information about d.
But we can say that a, c or e must equal 0.
Insufficient.

Combining both statements: the prompt tells us that c, d or e = 0. (1) That c is not 0, so d or e must equal 0. (2) Based on statement 1, c can't be 0, so a or e is 0.
If cde = 0, is d = 0 ? Since d or e could equal 0, both statements combined are still insufficient. Answer E.
[Reveal] Spoiler: OA

Last edited by mipek on 02 Oct 2016, 09:34, edited 1 time in total.
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Re: If a, b, c, d, and e are integers and cde = 0, is d = 0 ? [#permalink]

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New post 01 Oct 2016, 15:33
mipek
Your reasoning is absolutely on point. That is the simplest and straight forward approach to solve this question.
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Re: If a, b, c, d, and e are integers and cde = 0, is d = 0 ? [#permalink]

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New post 01 Oct 2016, 18:09
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mipek wrote:
If a, b, c, d, and e are integers and cde = 0, is d = 0 ?

(1) abc = 30
(2) ace = 0

I got the question right, but is my reasoning correct?

If cde = 0, then c, d or e must equal 0.

(1) Tells us that abc = 30. No information about d.
But we can say that c is different than 0.
Insufficient.

(2) Tells us that ace = 0. No information about d.
But we can say that a, c or e must equal 0.
Insufficient.

Combining both statements: the prompt tells us that c, d or e = 0. (1) That c is not 0, so d or e must equal 0. (2) Based on statement 1, c can't be 0, so a or e is 0.
If cde = 0, is d = 0 ? Since d or e could equal 0, both statements combined are still insufficient. Answer E.


Hi
The procedure is correct but a flaw while you combine the two statements..e is surely 0
II tells you either or all of a,c and E are 0 ..BUT a and c are surely NOT 0, so E is zero..

Now cde is 0, so either of three or some or all are 0.. BUT c is not 0, and e is 0..
Still cannot say anything about d.. it can be any number
Insufg
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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: If a, b, c, d, and e are integers and cde = 0, is d = 0 ? [#permalink]

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New post 02 Oct 2016, 06:21
chetan2u wrote:

Hi
The procedure is correct but a flaw while you combine the two statements..e is surely 0
II tells you either or all of a,c and E are 0 ..BUT a and c are surely NOT 0, so E is zero..

Now cde is 0, so either of three or some or all are 0.. BUT c is not 0, and e is 0..
Still cannot say anything about d.. it can be any number
Insufg


chetan2u,

Saying that in statement II a and c are surely NOT 0; would mean that you took some information from statement I with you, which is not permissible unless you are combining both statements.

Am I missing something?
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Re: If a, b, c, d, and e are integers and cde = 0, is d = 0 ? [#permalink]

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New post 02 Oct 2016, 07:59
mipek wrote:
chetan2u wrote:

Hi
The procedure is correct but a flaw while you combine the two statements..e is surely 0
II tells you either or all of a,c and E are 0 ..BUT a and c are surely NOT 0, so E is zero..

Now cde is 0, so either of three or some or all are 0.. BUT c is not 0, and e is 0..
Still cannot say anything about d.. it can be any number
Insufg


chetan2u,

Saying that in statement II a and c are surely NOT 0; would mean that you took some information from statement I with you, which is not permissible unless you are combining both statements.

Am I missing something?


Hi
You are correct. I have written that I have taken both statements together
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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: If a, b, c, d, and e are integers and cde = 0, is d = 0 ? [#permalink]

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New post 18 Jan 2017, 00:15
Combining both statements: abc + ace = 30 + 0 --> ac(b+e)=30 --> So to evaluate the stem we only know that c is not 0 --> insufficient
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Re: If a, b, c, d, and e are integers and cde = 0, is d = 0 ? [#permalink]

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New post 18 Jan 2017, 10:09
abc = 30

So, we know that a, b and c are not 0

but it is given that ace = 0

Since a and c are not 0, clearly e = 0

cde=0

We know c is not 0, we know e=0, but still nothing about d.
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Re: If a, b, c, d, and e are integers and cde = 0, is d = 0 ? [#permalink]

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New post 01 May 2017, 04:44
malavika1 wrote:
abc = 30

So, we know that a, b and c are not 0

but it is given that ace = 0

Since a and c are not 0, clearly e = 0

cde=0

We know c is not 0, we know e=0, but still nothing about d.


But since we know that a, c, d, e are all different integers then if e must be ZERO, then d must be non zero, so answer is C. What is wrong in this logic?
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If a, b, c, d, and e are integers and cde = 0, is d = 0 ? [#permalink]

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New post 12 May 2017, 02:46
Quote:
But since we know that a, c, d, e are all different integers then if e must be ZERO, then d must be non zero, so answer is C. What is wrong in this logic?


Who says they are different integers? The info in the question stem only says they are integers.

IF the question stem contained a part which said that the integers were unique, then yes, you would be right and the answer was C.

BUT, that's not the case, so d could be more then 0. So the answer must be E.
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Re: If a, b, c, d, and e are integers and cde = 0, is d = 0 ? [#permalink]

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New post 15 May 2017, 21:46
MaximD wrote:
IF the question stem contained a part which said that the integers were unique, then yes, you would be right and the answer was C.

I feel that if the question stem had mentioned that that the integers were unique, then the answer would have been B.

Then we would have:

cde = 0
ace = 0

Subtracting,

(d-a)ce = 0

d - a cannot be zero, because then d = a (but that's not possible since integers were unique).

So, ce = 0

This means that either c or e is zero.

So, d has to be non-zero.
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Re: If a, b, c, d, and e are integers and cde = 0, is d = 0 ? [#permalink]

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New post 17 May 2017, 23:01
Can someone confirm if my analysis above is correct?
Re: If a, b, c, d, and e are integers and cde = 0, is d = 0 ?   [#permalink] 17 May 2017, 23:01
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If a, b, c, d, and e are integers and cde = 0, is d = 0 ?

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