What is the value of ab^2 1. a = b-1 2. a = b^2-1 : GMAT Data Sufficiency (DS)
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# What is the value of ab^2 1. a = b-1 2. a = b^2-1

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Manager
Joined: 30 Jul 2011
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What is the value of ab^2 1. a = b-1 2. a = b^2-1 [#permalink]

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21 Aug 2011, 14:19
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45% (medium)

Question Stats:

71% (01:40) correct 29% (02:04) wrong based on 41 sessions

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What is the value of $$ab^2$$

1. $$a = b-1$$

2. $$a = b^2-1$$

[Reveal] Spoiler: OA

Last edited by restore on 02 Sep 2011, 06:52, edited 1 time in total.
Manager
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21 Aug 2011, 14:54
Are you sure it is not

a=b^2-1

In which case it is sufficient as

b-1 = b^2-1
b^2-b = 0 (add 1 to both sides and subtract b)
b can only have two values 0 or 1

0:0^2-0=0
1:1^2-1=0

If it is 0 then ab^2 will be 0.
If it is 1, then a has to be 0 as a=b^2-1 - so ab^2= 0

ab^2 is therefore 0.

Hope this helps (please recheck as I'm sure I have reviewed this before and statement 2 was as I have stated)
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Manager
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22 Aug 2011, 13:35
With the given information , i am getting E .
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22 Aug 2011, 14:02
restore wrote:
What is the value of $$ab^2$$

1. $$a = b-1$$

2. $$b = b^2-1$$

Could you please recheck your question and OA. If those are correct, please provide us with MGMAT OE. thanks
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Re: Value Problem   [#permalink] 22 Aug 2011, 14:02
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