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Source: — Data Sufficiency |
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by Frankenstein » Wed Jun 22, 2011 11:47 pm
Hi,
Even I believe the answer is E
If statement(2) had been a>0, then C would have been correct.
Cheers!

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by srikanthb.69 » Thu Jun 23, 2011 6:34 am
If |a|= b-c it can either be
a = b-c if a>0 or -a = b-c if a<0 or b=c if a=0
Info 1 says c+a !=b so that rules out the a>0 option
then |a| = b-c => -a = b-c if only we know a<0 and a!=0 which is given in\
the second option so the answer is C.

PS: If a=0 we can never say a=b-c and we will not have a unique answer.
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by Frankenstein » Thu Jun 23, 2011 6:44 am
srikanthb.69 wrote:If |a|= b-c it can either be
a = b-c if a>0 or -a = b-c if a<0 or b=c if a=0
Info 1 says c+a !=b so that rules out the a>0 option
then |a| = b-c => -a = b-c if only we know a<0 and a!=0 which is given in\
the second option so the answer is C.

PS: If a=0 we can never say a=b-c and we will not have a unique answer.
Hi,
You have taken |a| = b-c for granted when we have to check whether the equality holds.
I will give a counter example to disprove this :
1.)Consider: a =-1, b =2, c=1
i)a+c = 0 != b
ii)a < 0
|a| = 1, b-c =1
Is |a| = b-c? Yes
2)Consider: a =-1, b =4, c=2
i)a+c = 1 != b
ii)a < 0
|a| = 1, b-c = 2
Is |a| = b-c? No
Cheers!

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