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Is 1/(a-b)<b-a? 1. a<b 2. 1< la-bl

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SVP
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Is 1/(a-b)<b-a? 1. a<b 2. 1< la-bl [#permalink] New post 10 Aug 2009, 09:56
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

50% (02:19) correct 50% (01:06) wrong based on 7 sessions
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Is 1/(a-b)<b-a?

1. a<b
2. 1< la-bl
Current Student
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Re: good inquality ds [#permalink] New post 10 Aug 2009, 13:07
I feel A.

If b>a then b-a will be positive and 1/-ve will be negative so A is suff.

While on the other hand 1<la-bl is (-infi, -1) U(1, infi) this will give mixed results so A is sufficient.
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Re: good inquality ds [#permalink] New post 10 Aug 2009, 13:47
this is a situation similar to (1/(-x)) < x.

This can only b true if x>0..

Here, x = b-a

so, b-a> 0
or b>a
Manager
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Re: good inquality ds [#permalink] New post 10 Sep 2009, 08:21
As far as I understood, the second answer choice has absolute value in it, right?
If so, then A for me. Please,yezz, post an OA.
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Re: good inquality ds [#permalink] New post 10 Sep 2009, 15:19
A is sufficient to answer , B will give mixed results
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Re: good inquality ds   [#permalink] 10 Sep 2009, 15:19
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Is 1/(a-b)<b-a? 1. a<b 2. 1< la-bl

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