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Is ab = 1 ? (1) aba = a (2) bab = b

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Manager
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Joined: 14 Jun 2005
Posts: 99

Kudos [?]: 20 [0], given: 0

Is ab = 1 ? (1) aba = a (2) bab = b [#permalink]

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New post 06 Mar 2006, 11:57
00:00
A
B
C
D
E

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Is ab = 1 ?
(1) aba = a
(2) bab = b

Kudos [?]: 20 [0], given: 0

Manager
Manager
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Joined: 04 Jan 2006
Posts: 58

Kudos [?]: 3 [0], given: 0

 [#permalink]

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New post 06 Mar 2006, 12:49
My ans D.

Is ab = 1?
This can happen if a=b=1 or a=b=-1 or a and be are reciprocals

stmt 1:
aba = a
This will be true only if a=b=1 or a=b=-1 or a and be are reciprocals
So suff.

stmt 2:
bab =1
This will be true only if a=b=1 or a=b=-1 or a and be are reciprocals

So D

What's the OA?

Kudos [?]: 3 [0], given: 0

SVP
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Joined: 24 Sep 2005
Posts: 1883

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Re: DS - ab [#permalink]

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New post 06 Mar 2006, 21:08
hellom3p wrote:
Is ab = 1 ?
(1) aba = a
(2) bab = b


We still have to consider the case of a=b=0

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Manager
Manager
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Joined: 20 Feb 2006
Posts: 214

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 [#permalink]

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New post 08 Mar 2006, 15:07
I am for C.
(1) => a = 0 or ab = 1
(2) => b = 0 or ab = 1

If two statements are taken together, ab has to be 1. Hence, C.

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Director
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Joined: 23 Jun 2005
Posts: 838

Kudos [?]: 87 [0], given: 1

GMAT 1: 740 Q48 V42
 [#permalink]

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New post 08 Mar 2006, 15:14
I just was Chuckle's post.
What if a=b=0?


I was going for D as well.
Let's see,
1. aba=a
aa=a/b, a=1/b
ab=1, isn't that simple?
and the same works for statement two as well
2. bab=b
ab=1. So, it's D, right?

If I'm wrong, where am I going wrong?

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Intern
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Joined: 08 Feb 2006
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 [#permalink]

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New post 08 Mar 2006, 16:00
I choose D as well. by the same conclusion as above. :-D

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Manager
Manager
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Joined: 20 Feb 2006
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Kudos [?]: 19 [0], given: 0

 [#permalink]

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New post 08 Mar 2006, 17:47
This is a good question. None of the statements is good if a = b = 0.
I forgot to consider this condition.

Kudos [?]: 19 [0], given: 0

  [#permalink] 08 Mar 2006, 17:47
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Is ab = 1 ? (1) aba = a (2) bab = b

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