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

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CEO
Joined: 21 Jan 2007
Posts: 2734

Kudos [?]: 1076 [0], given: 4

Location: New York City
Does the AB=1? 1. ABA=A 2. BAB=B [#permalink]

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18 Nov 2007, 22:29
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

Does the AB=1?

1. ABA=A
2. BAB=B

Kudos [?]: 1076 [0], given: 4

CEO
Joined: 17 Nov 2007
Posts: 3583

Kudos [?]: 4672 [0], given: 360

Concentration: Entrepreneurship, Other
Schools: Chicago (Booth) - Class of 2011
GMAT 1: 750 Q50 V40

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18 Nov 2007, 22:36
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.

Kudos [?]: 4672 [0], given: 360

Director
Joined: 26 Feb 2006
Posts: 900

Kudos [?]: 162 [0], given: 0

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19 Nov 2007, 01:56
bmwhype2 wrote:
Does the AB=1?

1. ABA=A
2. BAB=B

E. in both cases, A and B could be 0 and 1.

Kudos [?]: 162 [0], given: 0

Director
Joined: 13 Nov 2003
Posts: 788

Kudos [?]: 64 [0], given: 0

Location: BULGARIA

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19 Nov 2007, 06:27
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

Kudos [?]: 64 [0], given: 0

CEO
Joined: 17 Nov 2007
Posts: 3583

Kudos [?]: 4672 [0], given: 360

Concentration: Entrepreneurship, Other
Schools: Chicago (Booth) - Class of 2011
GMAT 1: 750 Q50 V40

### Show Tags

19 Nov 2007, 08:29
BG wrote:
C is the ans

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

1 and 2 together still insufficient.

Kudos [?]: 4672 [0], given: 360

19 Nov 2007, 08:29
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# Does the AB=1? 1. ABA=A 2. BAB=B

Moderator: chetan2u

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