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Senior Manager
Joined: 05 May 2011
Posts: 351
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GMAT 1: 780 Q49 V50
WE:Research (Other)
Is |a| = b - c ? (1) a + c does not equal b (2) a < 0
[#permalink]
20 Sep 2011, 08:04
20 Sep 2011, 08:04
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A
B
C
D
E
Difficulty:
45%
(medium)
Question Stats:
55% (01:21) correct
45%
(01:24)
wrong
based on 111
sessions
Intern
Joined: 22 Aug 2011
Status:Target 660 -> 720(Q49,V41) retaking in Feb 2012
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Re: advanced ds question
[#permalink]
20 Sep 2011, 08:54
20 Sep 2011, 08:54
1) Simpliy Question
is a = b -c => a+c =b
or -a = b-c => c-a = b
It is a 2 part question a+c =b? or c-a=b?
2) Evaluate 1.
Insufficiant We dont know if c-a = b
3) Evaluate 2.
Insufficient we dont know the value of a and b
4) Evaluate 1 and 2 together
1. a+c != b
2. a is -ve so c-(-a)=> C+a =b? 1 says it is not
Sufficient to answer that |a|!=b -c
Ans C.
is a = b -c => a+c =b
or -a = b-c => c-a = b
It is a 2 part question a+c =b? or c-a=b?
2) Evaluate 1.
Insufficiant We dont know if c-a = b
3) Evaluate 2.
Insufficient we dont know the value of a and b
4) Evaluate 1 and 2 together
1. a+c != b
2. a is -ve so c-(-a)=> C+a =b? 1 says it is not
Sufficient to answer that |a|!=b -c
Ans C.
Re: advanced ds question
[#permalink]
20 Sep 2011, 11:05
20 Sep 2011, 11:05
1
Kudos
Expert Reply
rjdunn03 wrote:
Is |a| = b - c ?
(1) a + c does not equal b
(2) a < 0
(1) a + c does not equal b
(2) a < 0
If a = -1, b=0, and c=0, then both statements are true, and the answer to the question is 'no'.
If a = -1, b = 1 and c = 0, then both statements are true, and the answer to the question is 'yes'.
The answer is E.
Senior Manager
Joined: 05 May 2011
Posts: 351
Location: United States (WI)
GMAT 1: 780 Q49 V50
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Re: advanced ds question
[#permalink]
20 Sep 2011, 12:23
20 Sep 2011, 12:23
Thank you for the example Ian. I thought it was E as well, and wanted to see if I was missing something.
This question comes from Jeff Sackmans extreme challenge. He has C listed as the answer. I'm going to shoot him an e-mail and see if he responds. Looks like an error.
Thanks.
This question comes from Jeff Sackmans extreme challenge. He has C listed as the answer. I'm going to shoot him an e-mail and see if he responds. Looks like an error.
Thanks.
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Re: advanced ds question
[#permalink]
21 Sep 2011, 23:15
21 Sep 2011, 23:15
for a=-1|1 ,b=3|5, c=2
a false for a=1,b=5,c=2 but true for a=1,b=3,c=2. not sufficient.
b same for a=-1 and with different b values of 3 and 5. not sufficient.
a+b not sufficient for a=-1 b= 3|5 , c=2.
E it is.
a false for a=1,b=5,c=2 but true for a=1,b=3,c=2. not sufficient.
b same for a=-1 and with different b values of 3 and 5. not sufficient.
a+b not sufficient for a=-1 b= 3|5 , c=2.
E it is.
Re: advanced ds question
[#permalink]
22 Sep 2011, 23:31
22 Sep 2011, 23:31
E
1 & 2 are obviously insufficient alone
so we can eliminate a,b,d
between c & e
As Ian pointed out, there may or may not be an equality
Hence E
1 & 2 are obviously insufficient alone
so we can eliminate a,b,d
between c & e
As Ian pointed out, there may or may not be an equality
Hence E
Re: advanced ds question
[#permalink]
23 Sep 2011, 03:21
23 Sep 2011, 03:21
Both statement one and two gives no information about "b"
Therefore they are insufficient. Even together they dont give info about "b"
Therefore they are insufficient. Even together they dont give info about "b"
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Re: advanced ds question
[#permalink]
26 Sep 2011, 05:45
26 Sep 2011, 05:45
rjdunn03 wrote:
Is |a| = b - c ?
(1) a + c does not equal b
(2) a < 0
(1) a + c does not equal b
(2) a < 0
E for me. statement 1 and statement 2 are basically giving the same information.
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Posts: 351
Location: United States (WI)
GMAT 1: 780 Q49 V50
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Re: advanced ds question
[#permalink]
29 Sep 2011, 06:54
29 Sep 2011, 06:54
rjdunn03 wrote:
Is |a| = b - c ?
(1) a + c does not equal b
(2) a < 0
(1) a + c does not equal b
(2) a < 0
I also feel answer should be E
a+c = d and d != n
it does not matter whether a is positive or negative.
Re: Is |a| = b - c ? (1) a + c does not equal b (2) a < 0
[#permalink]
28 Aug 2020, 16:02
28 Aug 2020, 16:02
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Re: Is |a| = b - c ? (1) a + c does not equal b (2) a < 0 [#permalink]
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