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Equalities

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Source: — Data Sufficiency |
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by cramya » Sun Jan 04, 2009 1:36 pm
Stmt I

With a<b a/a-b < b-a

Cases possible:
a-> positive b->positive
a->negative b->positive
a> more negative b->less negative (i.e |b| < |a|)

SUFF

Stmt II

|a-b| > 1

a>b or a<b

INSUFF

Choose A)
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Re: Equalities

by duccio » Mon Jan 05, 2009 7:55 am
poonam1279 wrote:Pls help

1 a<b
so a-b<0 and b-a>0
1/(a-b)<0 and b-a>0
b-a>1/(a-b)
suff

2 |a-b|>1
first case
a-b>1 if a-b>0 <---> a>b <----> b<a <---> b-a<0 and 1/(a-b)>0
hence b-a<1/(a-b)
or
b-a>1 if a-b<0 <---> b>a <----> b-a>0 and a-b<0 <---> b-a>0 and 1/(a-b)<0
hence b-a>1/(a-b)
two different values Insuff
A
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