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

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Manager
Joined: 14 Jun 2005
Posts: 100
Followers: 1

Kudos [?]: 5 [0], given: 0

Is ab = 1 ? (1) aba = a (2) bab = b [#permalink]  06 Mar 2006, 10:57
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Is ab = 1 ?
(1) aba = a
(2) bab = b
Manager
Joined: 04 Jan 2006
Posts: 58
Followers: 1

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

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: 1893
Followers: 11

Kudos [?]: 139 [0], given: 0

Re: DS - ab [#permalink]  06 Mar 2006, 20:08
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 [?]: 5 [0], given: 0

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: 847
GMAT 1: 740 Q48 V42
Followers: 5

Kudos [?]: 31 [0], given: 1

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: 07 Feb 2006
Posts: 4
Followers: 0

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

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

Kudos [?]: 5 [0], given: 0

This is a good question. None of the statements is good if a = b = 0.
I forgot to consider this condition.
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