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For any numbers a and b, a * b = a + b ab. If a*b=0, which

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SVP
SVP
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Joined: 29 Aug 2007
Posts: 2493
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Kudos [?]: 593 [0], given: 19

For any numbers a and b, a * b = a + b ab. If a*b=0, which [#permalink] New post 09 Dec 2007, 23:17
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

For any numbers a and b, a * b = a + b – ab. If a*b=0, which of the following cannot be a value of b?

A 2
B 1
C 0
D -1
E -3/2
Manager
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Joined: 03 Sep 2006
Posts: 233
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Kudos [?]: 9 [0], given: 0

 [#permalink] New post 09 Dec 2007, 23:34
Corrected:

0 = a + b - ab
ab = a + b
ab - a = b
a * (b -1) = b
a = b / (b - 1)

b =/ 1

Last edited by Whatever on 09 Dec 2007, 23:58, edited 1 time in total.
Manager
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Joined: 29 Jul 2007
Posts: 182
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Kudos [?]: 17 [0], given: 0

Re: Value of b????????????/ [#permalink] New post 09 Dec 2007, 23:41
GMAT TIGER wrote:
For any numbers a and b, a * b = a + b – ab. If a*b=0, which of the following cannot be a value of b?

A 2
B 1
C 0
D -1
E -3/2


B. 1

if a*b = 0

0 = a + b - ab
ab = a+b
ab-b = a
b(a-1) = a
b = a/(a-1)

if b = 1, then a-1 = a --> -1 = 0
SVP
SVP
User avatar
Joined: 29 Aug 2007
Posts: 2493
Followers: 61

Kudos [?]: 593 [0], given: 19

Re: Value of b????????????/ [#permalink] New post 10 Dec 2007, 21:07
GMAT TIGER wrote:
For any numbers a and b, a * b = a + b – ab. If a*b=0, which of the following cannot be a value of b?

A 2
B 1
C 0
D -1
E -3/2


you both are correct. its B.
Re: Value of b????????????/   [#permalink] 10 Dec 2007, 21:07
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For any numbers a and b, a * b = a + b ab. If a*b=0, which

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