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

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Manager
Joined: 14 Jun 2005
Posts: 99
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Kudos [?]: 10 [0], given: 0

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

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06 Mar 2006, 11:57
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Is ab = 1 ?
(1) aba = a
(2) bab = b
Manager
Joined: 04 Jan 2006
Posts: 58
Followers: 1

Kudos [?]: 2 [0], given: 0

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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?
SVP
Joined: 24 Sep 2005
Posts: 1885
Followers: 22

Kudos [?]: 321 [0], given: 0

Re: DS - ab [#permalink]

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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
Manager
Joined: 20 Feb 2006
Posts: 213
Followers: 1

Kudos [?]: 10 [0], given: 0

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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.
Director
Joined: 23 Jun 2005
Posts: 841
GMAT 1: 740 Q48 V42
Followers: 6

Kudos [?]: 76 [0], given: 1

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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?
Intern
Joined: 08 Feb 2006
Posts: 4
Followers: 0

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

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08 Mar 2006, 16:00
I choose D as well. by the same conclusion as above.
Manager
Joined: 20 Feb 2006
Posts: 213
Followers: 1

Kudos [?]: 10 [0], given: 0

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

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