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# Does the AB=1? 1. ABA=A 2. BAB=B

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CEO
Joined: 21 Jan 2007
Posts: 2766
Location: New York City
Followers: 9

Kudos [?]: 331 [0], given: 4

Does the AB=1? 1. ABA=A 2. BAB=B [#permalink]  18 Nov 2007, 21:29
Does the AB=1?

1. ABA=A
2. BAB=B

CEO
Joined: 17 Nov 2007
Posts: 3578
Concentration: Entrepreneurship, Other
Schools: Chicago (Booth) - Class of 2011
GMAT 1: 750 Q50 V40
Followers: 399

Kudos [?]: 2091 [0], given: 359

Expert's post
I think E.

1. ABA=A --> AB * A = A -->
A=0: AB=0
A<>0: AB=1
insuff.

1. BAB=B --> AB * B = B -->
B=0: AB=0
B<>0: AB=1
insuff.
Director
Joined: 26 Feb 2006
Posts: 906
Followers: 4

Kudos [?]: 51 [0], given: 0

Re: ABA - Products [#permalink]  19 Nov 2007, 00:56
bmwhype2 wrote:
Does the AB=1?

1. ABA=A
2. BAB=B

E. in both cases, A and B could be 0 and 1.
Director
Joined: 13 Nov 2003
Posts: 794
Location: BULGARIA
Followers: 1

Kudos [?]: 25 [0], given: 0

Hi,
stmnt 1)
ABA-A=0 then A*(AB-1)=0 which means that the equation has 2 sol A=0 or AB=1
stmnt2) apply same reasoning and get B=0 or AB=1
then IMO C is the ans
C
CEO
Joined: 17 Nov 2007
Posts: 3578
Concentration: Entrepreneurship, Other
Schools: Chicago (Booth) - Class of 2011
GMAT 1: 750 Q50 V40
Followers: 399

Kudos [?]: 2091 [0], given: 359

Expert's post
BG wrote:
C is the ans

A,B=0 ==> AB=0
A,B=1 ==> AB=1

1 and 2 together still insufficient.
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