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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
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Joined: 30 Jul 2011
Posts: 118
Location: United States (NJ)
Concentration: General Management, Finance
GMAT 1: 520 Q40 V21
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What is the value of ab^2 1. a = b-1 2. a = b^2-1 [#permalink] New post 21 Aug 2011, 14:19
00:00
A
B
C
D
E

Difficulty:

  5% (low)

Question Stats:

50% (01:24) correct 50% (02:01) wrong based on 10 sessions
What is the value of ab^2

1. a = b-1

2. a = b^2-1

Please explain your answer.
[Reveal] Spoiler: OA

Last edited by restore on 02 Sep 2011, 06:52, edited 1 time in total.
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Joined: 19 Jul 2011
Posts: 100
Concentration: Finance, Economics
Schools: Duke '15
GPA: 3.9
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GMAT Tests User
Re: Value Problem [#permalink] New post 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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Re: Value Problem [#permalink] New post 22 Aug 2011, 13:35
With the given information , i am getting E .
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Re: Value Problem [#permalink] New post 22 Aug 2011, 14:02
restore wrote:
What is the value of ab^2

1. a = b-1

2. b = b^2-1

Please explain your answer.


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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