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a and b are integers

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Source: — Data Sufficiency |
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by user123321 » Tue Nov 08, 2011 1:38 pm
a and b are integers, and |a| > |b|
1) a<0
a b a.|b|<a-b
-3 -2 true
-3 1 false
hence insufficient.
2) ab>=0
a b a.|b|<a-b
-3 -2 true
-1 0 false
hence insufficient.
combining both
a b a.|b|<a-b
-1 0 false
-2 -1 true

hence insufficient

IMO E

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by bpdulog » Wed Nov 09, 2011 11:58 am
user123321 wrote:2) ab>=0
a b a.|b|<a-b
-3 -2 true
-1 0 false
How can you test -1 and 0 here? It doesn't meet the criteria that ab > 0.

You can use -1 and -1. That gives you a true.

Or -1 and 10. -10 < -11. This is false.
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by user123321 » Wed Nov 09, 2011 12:48 pm
bpdulog wrote:
user123321 wrote:2) ab>=0
a b a.|b|<a-b
-3 -2 true
-1 0 false
How can you test -1 and 0 here? It doesn't meet the criteria that ab > 0.

You can use -1 and -1. That gives you a true.

Or -1 and 10. -10 < -11. This is false.
the criteria given is ab>=0.
So a can be -1 and b can be 0.

I just took this as an example, you can take any valid values to make it false. If you get one true and one false you can say it is insufficient.

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