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alsergi: Junior | Next Rank: 30 Posts; Posts: 20; Joined: Tue Aug 19, 2008 11:24 pm

Inequities

by alsergi » Thu Aug 21, 2008 5:54 am

Please help me with this problem, I thought I kew how to solve it, but ...

If a^2= b Is a between 0 and 1 ?

1. a^3 > 0
2. b < a

Thank you very much!!

Last edited by alsergi on Thu Aug 21, 2008 7:38 am, edited 1 time in total.

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Source: Beat The GMAT — Data Sufficiency | Thu Aug 21, 2008 5:54 am

4meonly: Legendary Member; Posts: 891; Joined: Sat Aug 16, 2008 4:21 am; Thanked: 27 times; Followed by:1 members; GMAT Score:660(

by 4meonly » Thu Aug 21, 2008 7:26 am

1.- a^3 > 0
2.- b < a

Minus after dots means sigh?
Or this is
1. a^3 > 0
2. b < a
?

Quote

mim3: Senior | Next Rank: 100 Posts; Posts: 58; Joined: Fri Apr 04, 2008 12:36 pm; Thanked: 4 times; GMAT Score:680

[quote="alsergi"]Please help me with this problem, I thought I kew how to solve it, but ...

If a^2= b Is a between 0 and 1 ?

1. a^3 > 0
2. b < a

Thank you very much!![/quote]

Hi Alsergi,

Here's the way I thought about it:

1. a^3 > 0
From this we know that a is positive. We do not know, however, if a is a fraction (b/t 0 & 1) so it's insufficient

2. b< a
because a^2=b, we know that b HAS to be positive. So, if b< a, we know that a is positive as well. The only way for b< a is if a is a fraction. Thus, sufficient.

So I say it's B. What's the OA?