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

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Is ab = 1 ? (1) aba = a (2) bab = b [#permalink] New post 06 Mar 2006, 11:57
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Is ab = 1 ?
(1) aba = a
(2) bab = b
Manager
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 [#permalink] 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?
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Re: DS - ab [#permalink] 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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 [#permalink] 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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 [#permalink] 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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 [#permalink] New post 08 Mar 2006, 16:00
I choose D as well. by the same conclusion as above. :-D
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 [#permalink] 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.
  [#permalink] 08 Mar 2006, 17:47
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