For any numbers a and b, a * b = a + b ab. If a*b=0, which : Quant Question Archive [LOCKED]
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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
Joined: 29 Aug 2007
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Kudos [?]: 735 [0], given: 19

For any numbers a and b, a * b = a + b ab. If a*b=0, which [#permalink]

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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
Joined: 03 Sep 2006
Posts: 233
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Kudos [?]: 19 [0], given: 0

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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
Joined: 29 Jul 2007
Posts: 182
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Kudos [?]: 32 [0], given: 0

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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
Joined: 29 Aug 2007
Posts: 2492
Followers: 68

Kudos [?]: 735 [0], given: 19

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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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