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Senior Manager
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Is |a| = b - c ? (1) a + c does not equal b (2) a < 0 [#permalink]
 20 Sep 2011, 08:04
Question Stats:
44% (01:54) correct
56% (00:27) wrong based on 1 sessions
Is |a| = b - c ? (1) a + c does not equal b (2) a < 0
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Intern
Status: Target 660 -> 720(Q49,V41) retaking in Feb 2012
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Re: advanced ds question [#permalink]
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.
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Re: advanced ds question [#permalink]
20 Sep 2011, 11:05
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rjdunn03 wrote: Is |a| = b - c ?
(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.
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Senior Manager
Joined: 05 May 2011
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Re: advanced ds question [#permalink]
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.
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Re: advanced ds question [#permalink]
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.
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Re: advanced ds question [#permalink]
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
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Re: advanced ds question [#permalink]
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"
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Re: advanced ds question [#permalink]
26 Sep 2011, 05:45
rjdunn03 wrote: Is |a| = b - c ?
(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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Senior Manager
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Re: advanced ds question [#permalink]
27 Sep 2011, 07:55
Sackmann never wrote me back. Oh well.
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Re: advanced ds question [#permalink]
29 Sep 2011, 06:54
rjdunn03 wrote: Is |a| = b - c ?
(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.
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Re: advanced ds question
[#permalink]
29 Sep 2011, 06:54
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